水中腐植酸现场快速检测方法实验研究

An experimental study of the in-situ fast detecting method for dissolved humic acid

饮用水中的微量腐植酸能与重金属形成稳定的络合物,从而对水体中重金属的存在形态、迁移转化起着重大的作用,因此测定水中腐植酸的含量对评价地质环境与地方病的关系有着重要意义。实验室中检测腐植酸的方法很多,但绝大多数不适合野外快速检测应用。在综合分析实验室各种检测方法优缺点的基础上,提出了用比色法快速检测水中腐植酸。在实验室中用Ports-15光谱仪,2cm、5cm光纤比色探头,650nm波长的红光,分别对该方法进行测试,给出了腐植酸浓度与吸光度关系曲线,确定该方法的最低检出限、重复度和合适光程的比色探头。

Micro-humic acid in drinking water can form stable complexes with heavy metals in the water, which might affect the modes of occurrence, movements and transformations of heavy metals. It is thus important to measure the content of humic acid in the water for assessing the relationship between the geological environment and the endemic disease. There exist quite a few measurement techniques for humic acid in the laboratory, but most of them are not suitable for rapid detection in the field. On the basis of analyzing characteristics of every detecting means, the authors put forward the colorimetry for detecting the humic acid in the water. Ports-15 spectrometer with 1cm optical fiber color comparison probe and 650nm wavelength red light was used in the laboratory for the test,. As a result, the curve for the relationship between the thickness of the humic acid and the absorbency was drawn.