微流控层流-荧光分光光度法测定水中弱酸可分解氰化物

Determination of Weak Acid Dissociable Cyanide in Water by Fluorescence Spectrophotometry with Microfluidic Laminar Flow

摘要: 样品经活性炭吸附-Pb²⁺沉淀法除去硫醇和S^2-后，利用基于双Ψ型微流控（层流流量不大于18.0 μg·L^-1）芯片的多流路平行层流处理样品，采用荧光分光光度法测定其中CN^-的含量。结果表明：利用层流间高效传质特性，实现了水中痕量的弱酸可分解氰化物的高效传质转移；CN^-的线性范围为1.00~10.00 μg·L^-1，检出限（3s/k）为0.12 μg·L^-1，以河水样品为基体进行加标回收试验，回收率为99.5%，102%，测定值的相对标准偏差（n=6）小于3.5%。

Abstract: Thiol and sulfion in the sample was removed by activated carbon absorption-lead ion precipitation method, and the sample was treated with the multi-flow parallel laminar flow based on double-Ψ microfluidic (laminar flow not more than 18.0 μg·L^-1) chip. CN^- in the sample was determined by fluorescence spectrophotometry. As shown by the results, trace weak acid dissociable (WAD) cyanide in water had an efficient transfer by laminar flow with high mass transfer efficiency. Linear range of CN^- was found to be 1.00-10.00 μg·L^-1, with detection limit (3s/k) of 0.12 μg·L^-1. Test for recovery was made by the standard addition method using river water as matrix, giving results of 99.5%, 102%, with RSDs (n=6) less than 3.5%.