摘要
目的建立了一种新的测定甲醛的分光光度法。方法在稀硫酸条件下,基于痕量甲醛对硫酸亚钴-乙二胺体系颜色变化有明显的促进作用,采用分光光度法测定甲醛含量。结果该体系稳定性好,样品保存时间至少可延长至7个工作日。线性范围为0.10～3.6mg/L,检测下限为0.16mg/L,线性相关系数为0.9976。结论该法简便快捷,灵敏度高,重现性好,适用于饮用水加标回收率实验及脲醛树脂中的游离甲醛含量检测。
Objective To propose a new spectrophotometric method for determination of trace formaldehyde. Methods The method was based on the sensitive effect of formaldehyde in the system of cobaltous sulfate with ethylenediamine in sulfuric acid medium. Results The stable system of cobaltous sulfate with ethylenediamine could be kept seven days at least. Formaldehyde in the linear concentration range of 0.10-3.6 μg/ml was determined with a detection limit of 0.16 μg/ml, and the correlation coefficient was 0.997 6. Conclusion This method is simple, quick and has a high sensitivity and a good reproducibility. It has been applied to measure the given formaldehyde in tap water and free formaldehyde in UF resin with satisfactory results.
出处
《环境与健康杂志》
CAS
CSCD
北大核心
2005年第1期59-61,共3页
Journal of Environment and Health
关键词
甲醛
分光光度法
硫酸亚钴
乙二胺
Formaldehyde
Spectrophotometry
Cobaltous sulfate
Ethylenediamine
