Khongrangdee Thatsanee, Somboot Wasin, Jakmunee Jaroon, Kanyanee Tinakorn
Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand.
The Graduate School, Chiang Mai University, Chiang Mai, 50200, Thailand.
Anal Sci. 2020 Nov 10;36(11):1353-1357. doi: 10.2116/analsci.20P158. Epub 2020 Jul 3.
A cost-effective flow-batch analysis approach with colorimetric measurement has been developed for sulfide ion determination in turbid water samples without using a conventional pump and valve. Under an acidic condition, sulfide ion was converted to hydrogen sulfide gas and liberated out from other complicated matrices. The porous membrane-based diffusion scrubber was utilized as a gas trapping unit for hydrogen sulfide gas separation/preconcentration. From the correlation of sulfide ion concentration and disappearance of sodium nitroprusside reagent detection by using a homemade LED-photodiode based colorimetry, a linear relationship of sulfide ion concentration and absorbance can be obtained with relative standard deviation (%RSD) less than 5%. The limit of detection was 5.6 μmol L. The proposed system was applied for sulfide ion determination in wastewater samples with the recoveries of 91.0 - 105.2%. The proposed system is a robust setup and able to handle turbid water samples without a sample filtering step.
已开发出一种具有比色测量功能的经济高效的流动-间歇分析方法，用于在不使用传统泵和阀门的情况下测定浑浊水样中的硫化物离子。在酸性条件下，硫化物离子转化为硫化氢气体并从其他复杂基质中释放出来。基于多孔膜的扩散洗涤器用作硫化氢气体分离/预浓缩的气体捕集单元。通过使用自制的基于发光二极管的比色法，根据硫化物离子浓度与硝普钠试剂检测消失之间的相关性，可获得硫化物离子浓度与吸光度的线性关系，相对标准偏差（%RSD）小于5%。检测限为5.6 μmol/L。所提出的系统应用于废水样品中硫化物离子的测定，回收率为91.0 - 105.2%。所提出的系统是一个强大的装置，能够在不进行样品过滤步骤的情况下处理浑浊水样。
