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本文提出以meso-四(4-磺酸基苯基)卟啉(TPPS_4)为显色剂和CTMAB、β-CD为辅助配合剂,在酸性条件下灵敏度最高的测定痕量银的分光光度新体系。实验发现在此显色反应进行完全后,以适量H_2SO_4溶液(2+3)酸化,将过量的显色剂转化为质子化H_4P~(2+)形体,其最大吸收波长红移,而配合物稳定且最大吸收峰不变,增大了对比度(Δλ=66nm);同时提高了方法的灵敏度和选择性,表观摩尔吸光系数ε=5.21×10~5L/mol·cm。应用本法于相纸、定影废液和矿石等试样中银的测定,与AAS法结果一致。
In this paper, meso-tetrakis (4-sulfophenyl) porphyrin (TPPS_4) as chromogenic agent and CTMAB, β-CD as auxiliary complexing agent, the highest sensitivity under acidic conditions for the determination of trace silver spectrophotometry system. It was found that after the chromogenic reaction was completed, acidified with an appropriate amount of H 2 SO 4 solution (2 + 3), the excess color reagent was converted to protonated H 4 P 2+ and its maximum absorption wavelength was red shifted, while the complex Stable and the maximum absorption peak unchanged, increasing the contrast (Δλ = 66nm); at the same time, the sensitivity and selectivity of the method are improved. The apparent molar absorptivity ε = 5.21 × 10-5L / mol · cm. The application of this method in the photographic paper, flotation of waste and ore and other samples of silver in the determination, consistent with the results of AAS.