酸性光亮镀锡镍合金镀液中镍的快速测定

Rapid Determination of Nickel in the Acidic Brightening Tin Nickel Alloy Plating Bath

采用 5 -Br -PADAP分光光度法测定新型酸性光亮镀锡镍合金镀液中的镍。研究了酸度、Tween - 80的用量、三乙醇胺的用量、显色剂的用量和干扰离子对测定的影响。结果表明 ,在 pH=3.5的条件下 ,Ni2 + - 5 -Br -PADAP最大吸收波长为 5 74nm ;镍量在 0～ 9μg/ 2 5mL范围内服从朗比定律。该方法简便快速 ,重现性好 ,准确度高 ,样品加标回收率达 98%以上 。

The nickel in the acidic brightening tin nickel alloy plating bath was measured making use of 5 Br [2 (2 pyridylazo) 5 diethylaminophenol](coded as PADAP) spectrophotometry. Thus the effects of the acidity, the dosage of Tween 80, triethanolamine, and color reagent, and the interfering ions on the measurement of Ni were investigated. Results showed that the maximum adsorption wavelength for Ni^(2+) 5 Br PADAP at pH=3.5 was located at 574 nm. It obeyed the Beer's law within a nickel content range of 0～9 μg/25 mL. The established method was simple and expeditious and had good reproducibility and accuracy. It was feasible to retrieve the Ni element to be measured at a recovery rate above 98% with respect to the standard solution, indicating that the method could find promising application in engineering practice.