【摘要】 研究了1-(2,6-二溴-4-硝基苯)-3-(4-硝基苯)-三氮烯(DBNPNPT)与Ag(Ⅰ)的显色反应。在Na2B4O7-NaOH缓冲溶液(pH=10.0)中和在Triton X-100存在下,试剂与Ag(Ⅰ)生成1∶1的配合物。该配合物在波长445 nm处有正吸收峰,在530 nm有负吸收峰,用双峰双波长法测得配合物的表观摩尔吸光系数为2.06×105L.mol-1.cm-1,符合比耳定律的范围为0~12μg/25mL。该法已用于回收定影液中银(Ⅰ)的测定,结果满意。更多还原

【Abstract】 The chromogenic reaction of 1-（2,6-dibromo-4-nitrophenyl）-3-（4-nitrophenyl）-triazene with silver has been discussed in this paper. In the buffer solution of Na₂B₄O₇-NaOH（pH 10.0） and with the existence of surfactant of Triton X-100,the chromogenic reagent reacted with silver to form a complex with molar ratio of 1∶1.This compound had a positive peak at 445 nm and a negative peak at 530 nm.The apparent molar absorptivity was 2.06×10⁵ L·mol^-1·cm^-1 with double peaks and double wavelengths method.Beer’s law was obeyed in the concentration range of 0～12 μg/25mL.The method has been employed to determine the trace amounts of silver in photographic waste solution with satisfactory results.更多还原