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<span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px">近年来随着我国社会主义建设事业的迅猛发展,以及人们生活水平的迅速提高,百姓购房,居室装饰装修已成为消费热点。但有些装饰装修材料的有害物质没有得到有效控制。即给室内空气带来了一定的污染。而甲醛是室内空气中重要污染物,毒性较大,具有潜在致癌性,甲醛来源于建筑材料、砖瓦、混凝土、板材、石材、保温材料、涂料、粘结剂。其中室内装修材料粘合剂是甲醛的主要来源,尤以所用人造板为甚。甲醛是一种具有强烈刺激性的挥发性的有机化合物,它对人的眼睛、鼻子、呼吸道有刺激作用,低浓度的甲醛可以使皮肤过敏。引起咳嗽、失眠、恶心、头痛等症状。儿童易发生气喘病。甚至致突变、致癌,甲醛已经被世界卫生组织确定为致癌和致畸形物质,是公认的变态反应源,也是潜在的强致突变物之一。这些都严重影响了人们的正常生活和工作。由此可见,我们应该知道室内空气中甲醛的测定方法并了解如何控制污染,保证我们能够健康的工作生活。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 1.甲醛的来源和危害</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 甲醛(化学分子式hcho,分子量:30.03,是一种无色,有强烈刺激性气味的气体。易溶于水、醇醚。甲醛在常温下是气态,通常以水溶液形式出现。其40%的水溶液称为福尔马林,此溶液沸点为19℃。故在室温时极易挥发,随着温度的上升挥发速度加快。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 1.1甲醛的来源</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 在日常生活中经常用作室内装饰的胶合板、细木工板、中密度纤维板和刨花板等人造板材中含有甲醛。因为甲醛具有较强的粘合性,还具有加强板材的硬度及防虫、防腐的功能,所以用来合成多种粘合剂如:脲醛树脂,三聚氰甲醛,胺基甲醛树酯,酚醛树脂。含有甲醛成分并有可能向外界散发的其他各种装饰建筑材料,比如用脲醛泡沫树酯作为隔热材料的预制板、贴墙布、贴墙纸、化纤地毯、泡沫塑料、油漆和涂料等。目前生产人造板使用的胶粘剂以甲醛为主要成分的脲醛树脂,板材中残留的和未参与反应的甲醛会逐渐向周围环境释放,是形成室内空气中甲醛的主体,装修材料及新的组合家具是造成甲醛污染的主要来源。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 1.2甲醛的危害</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 甲醛为较高毒性的物质,在我国有毒化学品优先控制名单上甲醛高居第二位。室内甲醛对人体健康的危害可归纳为刺激作用,毒性作用和致癌作用。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 甲醛对人体的刺激作用主要表现为对眼睛,皮肤,粘膜的刺激作用,引起眼痛,流泪,皮炎等症状。长期接触低剂量甲醛,可引起慢性呼吸道疾病,可引起鼻咽癌,结肠癌,脑瘤,细胞核的基因突变,dna单链内交连和dna与蛋白质交连及抑制dna损伤的修复,可引起新生儿染色体异常,白血病,也可引起青少年记忆力和智力下降。在所有接触者中,儿童和孕妇对甲醛尤为敏感,危害也就更大。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 甲醛对人体的毒性作用主要是对眼部,呼吸系统,肺功能,神经系统功能和免疫系统具有毒性作用。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 甲醛对人体的致癌作用是因甲醛是一种较强的致突变,致癌物质,是引起肿瘤死亡的危险因素之一,动物实验多次证明甲醛既是致癌剂又是促癌剂。更多的报道显示暴露甲醛中的人群肿瘤死亡率显著高于非暴露的人群。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 因此对于室内甲醛的污染检测有着较强的现实意义,室内环境空气中甲醛的测定方法主要有:酚试剂分光光度法,气相色谱法,电化学法,传感器法。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 2.酚试剂分光光度法</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 酚试剂法,即甲醛与酚试剂反应生成嗪,嗪在酸性溶液中被铁离子氧化成蓝色,室温下经15分钟后显色,然后比色定量。酚试剂法操作简便,灵敏度高,检出限为0.02mg/l,较适合测定微量甲醛测定。酚试剂的稳定性较差,显色剂在4℃冰箱内可以保存3d,本法多用于室内空气中对甲醛的检测。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> </span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 2.1酚试剂分光光度法的原理</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 空气中的甲醛与酚试剂反应生成嗪,嗪在酸性溶液中被高铁离子氧化形成蓝绿色化合物,最大吸收波长为630nm。根据颜色深浅,比色定量。用5ml样品溶液,本法测定范围为0.1~1.5μg;采样体积为10l时,可测浓度范围0.01~0.15mg/m3。灵敏度为2.8微克/吸光度。检出下限0.056μg甲醛。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 2.2酚试剂分光光度法的试剂</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 本法中所用水均为重蒸馏水或去离子交换水;所用的试剂纯度一般为分析纯。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> (1)吸收液原液:称量0.10g酚试剂[简称nbth],加水溶解,倾于100ml具塞量筒中,加水到刻度。放冰箱中保存,可稳定三天。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> (2)吸收液:量取吸收原液5ml,加95ml水,即为吸收液。采样时,临用现配。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> (3)1%硫酸铁铵溶液:称量1.0g硫酸铁铵[nh4fe(so4)2·12h2o]用0.1mol/l盐酸溶解,并稀释至100ml。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> (4)碘溶液[c(1/2i2)=0.1000mol/l]:称量40g碘化钾,溶于25ml水中,加入12.7g碘。待碘完全溶解后,用水定容至1000ml。移入棕色瓶中,暗处贮存。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> (5)1mol/l氢氧化钠溶液:称量40g氢氧化钠,溶于水中,并稀释至1000ml。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> (6)0.5mol/l硫酸溶液:取28ml浓硫酸缓慢加入水中,冷却后,稀释至1000ml。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> (7)硫代硫酸钠标准溶液[c(na2s2o3)=0.1000mol/l]:可按附录制备。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> (8)0.5%淀粉溶液:将0.5g可溶性淀粉,用少量水调成糊状后,再加入100ml沸水,并煮沸2~3min至溶液透明。冷却后,加入0.1g水杨酸或0.4g氯化锌保存。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> (9)甲醛标准贮备溶液:取2.8ml含量为36~38%甲醛溶液,放入1l容量瓶中,加水稀释至刻度。此溶液1ml约相当于1mg甲醛。其准确浓度用下述碘量法标定。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> </span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 甲醛标准贮备溶液的标定:精确量取20.00ml待标定的甲醛标准贮备溶液,置于250ml碘量瓶中。加入20.00ml[c(1/2i2)=0.1000mol/l]碘溶液和15ml1mol/l氢氧化钠溶液,放置15min,加入0.5mol/l硫酸溶液,再放置15min,用[c(na2s2o3)=0.1000mol/l]硫代硫酸钠溶液滴定,至溶液呈现淡黄色时,加入1ml5%淀粉溶液继续滴定至恰使蓝色褪去为止,记录所用硫代硫酸钠溶液体积(v2)ml。同时用水作试剂空白滴定,记录空白滴定所用硫化硫酸钠标准溶液的体积(v1)ml。</span><br style="font-weight: normal; font-size: 12px; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"><span style="display: inline! important; font-weight: normal; font-size: 12px; float: none; word-spacing: 0px; text-transform: none; color: rgb(100,100,100); text-indent: 0px; font-style: normal; font-family: 宋体; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); font-variant-ligatures: normal; font-variant-caps: normal; orphans: 2; widows: 2; webkit-text-stroke-width: 0px"> 沧州除甲醛专业机构-净康环保为您的居室健康保驾护航</span>
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