| β修正孔雀绿光度法测定工业废水中银 |
| 摘要点击 733 全文点击 838 投稿时间：1994-08-01 |
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| 中文关键词 β修正原理 分光光度法 银 孔雀绿 真实吸光度 |
| 英文关键词 β-correction spectrophotometry silver malachite green real absorbance |
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| 中文摘要 |
| 在pH5醋酸盐缓冲溶液中,银(Ag+)与孔雀绿(MG)和碘化钾作用生成绿色缔合物。β修正光度法利用该显色反应能完全消除反应体系中过量MG干扰,计算综合产物真实吸光度。分析灵敏度、精密度和准确度均比普通单波长光度法有明显提高。结果表明:银浓度0—2.0mg/L内符合比耳定律,方法检出限0.05mg/L;废水加标回收率97.3%—107%,相对标准偏差(RSD)6.2%。 |
| 英文摘要 |
| Silver has been found to react with both malachite green (MG) and potsssiuin iodide to form a green chelate at pH 5. β-correction spectrophotometry was studied for the determination of trace amounts of silver. This method can eliminate completely the excess MG in its Ag(Ⅰ) colored solution to give out the real absorbance of prodanced Ag-MG-I- chelate. The reaction of Ag-MG-I- is selective in the presence of EDTA to mask other metal ions. The β-correction method has higher sensitivity, precision and accuracy than a conventional single wavelength spectrophotometry. Beer's law was obeyed over the concentration range of 0—2.0 mg/L of silver and the detection limit for Ag is 0.05 mg/L which is suitable for the analysis of wastewater. The recovery was found to be between 97.3%—107%, with a RSD of 6.2%. |
