【摘要】 合成了1-(4-硝基苯)-3-(5-氯-2-吡啶)三氮烯(NPCPDT),并研究了NPCPDT与银的显色反应。在Na2B4O7NaOH缓冲溶液(pH10.0)介质中,在TritonX100存在下,NPCPDT与Ag生成1∶1配合物。配合物在470nm处有最大吸收峰,表观摩尔吸光系数ε为1.46×105L·mol-1·cm-1,Ag含量在0～12μg/25mL范围内符合比耳定律。方法用于回收定影液中银的测定,结果满意。更多还原

【Abstract】 The synthesis of a new reagent 1-（4-nitrophenyl）-3-（5-chloro-2-pyridyl）-triazene （NPCPDT） and its colour reaction with silver have been studied in this paper.In the buffer solution of Na₂B₄O₇-NaOH（pH 10.0） and with the existence of surface active agent of Triton X-100,the chromogenic reagent reacted with silver to form a complex with a molar ratio of 1∶1.This compound had a positive peak at 470nm,the apparent molar absorptivity was 1.46×105L·mol -1·cm -1.Beer′s law was obeyed in the silver concentration range of 0～12μg/25mL.The method has been employed to determine trace amounts of silver in photographic waste solution with satisfactory results.更多还原