电感耦合等离子体质谱法测定磷矿石中锰、铜、铅、锌、铬、镉

Determination of Manganese,Copper,Lead,Zinc,Chromium and Cadmium in Phosphate Rock by Inductively Coupled Plasma Mass Spectrometry

建立了HNO3-HClO4-HF混合酸溶样，电感耦合等离子体质谱法同时测定磷矿石中的锰、铜、铅、锌、铬和镉等6个微量重金属元素的有效方法．试验中对仪器的最佳工作参数进行了优化，选择适当的同位素，并用铑作内标元素，有效地抑制了分析信号的漂移．在选定的条件下，对样品进行了精密度和回收率试验，方法相对标准偏差（RSD，n=9）为0．99％-1．98％，加标回收率为98．0％-102．0％．

A method for the determination of manganese, copper, lead, zinc, chromium and cadmium in phosphate rock by inductively coupled plasma-mass spectrometry （ICP- MS ） is established. The ICP- MS instrument operating parameters were optimized. The mass spectral interferences were eliminated by selecting ^55 Mn,^65Cu,^208pb,^66Zn,^52Cr and ^114Cd as the analytical isotopes. And Rh was selected as the internal standard to compensate the analytical signal drift. Under the optimized conditions with a HNO3 -HClO4-HF digestion system, the recoveries for these elements were 98.0% - 102.0% with a precision of 0.99% - 1.98% RSD （n = 9 ）. The proposed method has been applied to the determination of these trace heavy metal elements with satisfactory results.