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新房装修后甲醛检测有什么好的方法？

新房装修后甲醛检测有什么好的方法？

浏览：46次 | 提问时间： 07-10 10:12

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3个答案

一个人的夜 07-10 10:13

第一方法，正常工作时间您可以用甲醛检测盒，来检测，使用很简单，不过检测必须得封闭门窗，不同的产品封闭时间也不同，有的要求2小时，有的要求6小时，8小时。
第二方法，找专业的检测机构来检测，他们有检测报告，起码算是个证据，不过这种专业检测需要封闭门窗12小时，也就是说您晚上把门窗都关好。

前度 07-10 10:22

室内空气环境内甲醛含量甲醛检测可分为：
(1)AHMT 分光光度法
分光光度法测定的主要方法有乙酰丙酮法、铬变酸法、MBTH法、副品红法、AHMT 法等几种。

1.1乙酰丙酮法
　　乙酰丙酮法原理是利用甲醛与乙酰丙酮及氨生成黄色化合物二乙酰基二氢卢剔啶后，412nm下进行分光光度测定。
　　此法最大的优点是操作简便，性能稳定，误差小，不受乙醛的干扰，有色溶液可稳定存在12hr；缺点是灵敏度较低，最低检出浓度为0.25mg/L，仅适用于较高浓度甲醛的测定；方法缺点是反应较慢，需要约60min；SO2对测定存在干扰(使用NaHSO3作为保护剂则可以消除)。该方法非常传统，应用极为广泛。

1.2变色酸法 (CTA法)
　　变色酸法也称铬变酸法，甲醛在浓硫酸溶液中可与变色酸(1，8-二羟基萘-3，6-二磺酸)作用形成紫色化合物，该化合物最大吸收波长在5 80n m处，可用分光光度法进行分析测定。改变变色酸浓度和采用不同的采样手段，可满足不同浓度甲醛检测需要。用0.1%变色酸-86%硫酸溶液作吸收液，检测限可达20μg/L；用1%亚硫酸钠溶液吸收甲醛，变色酸浓度改为5%，方法更稳定、更灵敏。该法的优点是操作简便、快速灵敏；缺点是在浓硫酸介质中进行，不易控制，且醛类、烯类化合物及NO2等对测定有干扰。

1.3酚试剂法
　　酚试剂法原理是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，颜色深浅与甲醛含量成正比，该化合物　在630nm处摩尔吸光系数ε可达7.0×104，该法对甲醛的测定非常灵敏最低检测限为0.015mg/L。方法的缺点是乙醛、丙醛的存在会对测定结果产生干扰，存在二氧化硫时测定结果偏低，反应受温度限制，室温低于15，显色不完全，20～35时15min显色最完全，放置4小时，吸收情况稳定不变。

1.4副品红法(PRA)
　　副品红法原理是在甲醛存在下，亚硫酸根离子与副品红生成紫色络合物，其最大吸收峰在570nm处，检测限为50μg/L。本法的优点是简便灵敏，其它醛和酚不干扰测定；缺点是褪色快，灵敏度不高，易受温度影响，使用了有毒的汞试剂，而且生色化合物需要至少60min才能达到稳定的吸收。使用流动注射技术，可消除分光光度法显色慢、灵敏度低和稳定性差的缺点。

1.5AHMT法
AHMT法原理是甲醛与4-氨基-3-联氨-5-巯基-1，2，3－三氮杂茂(AHMT)在碱性条件下缩合，然后经高碘酸钾氧化成6- 基-5-三氮杂茂[4，3-b] -S-四氮杂苯紫红色化合物，比色定量。该方法优点是抗干扰能力强，对乙酰丙酮法、MBTH法及副品红法干扰严重的六胺对此测定方法无干扰，因此，该法是测定树脂交联过程释放甲醛的有效方法；灵敏度较高，最低检出限为0.01mg/m3，较适宜与一般情况下室内空气的检测；缺点是颜色随时间逐渐加深，要求标准溶液的显色反应和样品溶液的显色反应时间必须严格统一，在显色体系最大吸收波长550nm测定，Co2+、Cu2+干扰测定。

陌影灬 07-10 10:30

观察动植物的反应也能在一定程度上检测甲醛，比如植物枯萎死亡，这正好发生在搬入新居以后。养的宠物生病，不吃食物，抵抗力低下，活力下降，总是喜欢静静呆着。如果这样的情况发生的时候，同时你的家人也有类似抵抗力低下的反应，基本可以确定你的新居是有问题的。

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