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本文研究了铜-7-碘-8-羟基喹啉-5-磺酸(7-I-H_2QS)络合物的极谱行为,提出在pH 8～10的7-I-H_2QS(4×10~(-4)mol·L~(-1))-en(0.12%)-KSCN(0.8g·L~(-1)Na_3C_6H_5O_7(8g·L~(-1))-Na_2SO_3(3g·L~(-1)体系中,可得到一灵敏的铜-7-I-H_2QS络合波。经金属锡样品分析,结果令人满意。 1 试验部分1.1 仪器与主要试剂 IP-2型示波极谱仪;三电极;二阶导数亚硫酸钠(Na_2SO_3);50g·L~(-1) 柠檬酸三钠(Na_3C_6H_5O_7):20Og·L~(-1) 混合底液:称取0.35lg 7-I-H_2QS溶于水3OOml中,加入无水乙二胺(en)3ml·KSCN 2g,溶解并稀释至500ml。铜标准溶液:1.000mg·ml~(-1),HNO_3(2+98)介质,使用时稀释至合适浓度。
In this paper, the polarographic behavior of 7-iodo-8-hydroxyquinoline-5-sulfonic acid (7-I-H 2 QS) ~ (-4) mol·L ~ (-1)) - en (0.12%) - KSCN (0.8g · L -1) Na_3C_6H_5O_7 (8g · L -1) (-1) system, a sensitive copper-7-I-H 2 QS complex can be obtained.Analysis of metal tin samples showed satisfactory results.1 Experimental Section 1.1 Instruments and Major Reagents IP-2 Oscillopolarography Instrument; three electrodes; second derivative sodium sulfite (Na_2SO_3); 50g · L -1 trisodium citrate (Na_3C_6H_5O_7): 20Og · L -1 mixed bottom liquid: Weigh 0.35lg 7-I-H 2 QS Dissolve and dilute to 500ml with 3ml · KSCN of anhydrous ethylenediamine (en) dissolved in 3OOml of water Copper standard solution: 1.000mg · ml -1, HNO 3 (2 + 98) medium, when used Dilute to the appropriate concentration.