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本文提出一个在碱性介质中用OP—10为分散剂,P—DMABR为试剂测定Ag~+的新体系,以此为基础建立了废水中微量银的流动注射——吸收光度测定法。在最佳条件下银的定量范围为2.0—20.0ppm;最低检出限为0.4ppm;进样速率可达每小时120个试样。一些重金属离子的干扰可用向载液中加适宜浓度的EDTA除去,S~(2-)、S_2O_3~(2-)和I~-等干扰可予先氧化除去。方法适用于多种废水试样分析,结果令人满意。
In this paper, we present a new system for the determination of Ag ~ + using OP-10 as dispersant and P-DMABR as reagent in alkaline medium. Based on this, a flow injection-absorption spectrophotometry for the determination of trace silver in wastewater was established. Under the optimal conditions, the quantitative range of silver is 2.0-20.0ppm; the minimum detection limit is 0.4ppm; the injection rate can reach 120 samples per hour. The interference of some heavy metal ions can be removed by adding appropriate concentration of EDTA into the carrier liquid. The interferences such as S 2 -, S 2 O 3 ~ (2-) and I ~ can be oxidized and removed first. The method is suitable for a variety of wastewater samples analysis, the results are satisfactory.