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研究发现：在阴离子表面活性剂十二烷基硫酸钠（ＳＤＳ）存在下，以混酸－氢氧化钠缓冲液控制酸度，利用镍与４－（５－氯－２－吡啶偶氮）－１，３－二胺基苯（５－Ｃｌ－ＰＡＤＡＢ）生成紫红色络合物的吸收光谱，可直接光度法测镍。该体系稳定性好，摩尔吸光系数为１．２２×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，镍量在０～１５μｇ·２５ｍＬ－１范围内符合比耳定律
It was found that the acidity was controlled by mixed acid-sodium hydroxide buffer in the presence of anionic surfactant sodium dodecyl sulfate (SDS), and the interaction between nickel and 4- (5-chloro-2-pyridylazo) The absorption spectrum of 3-diaminobenzene (5-Cl-PADAB) generating fuchsine complex can be measured directly by spectrophotometry. The system has good stability, molar extinction coefficient of 1.22 × 105L · mol-1 · cm-1, nickel content in the range of 0 ~ 15μg · 25mL-1 Beer’s Law