ICP-AES中三种进样方式对基体干扰影响研究

本文介绍了ICP-AES中基体干扰的研究工作,主要是通过比较流动注射、蠕动泵、气动提升三种进样方法的酸效应和化学干扰的特点和程度,发现蠕动泵进样法的酸效应仍相当严重,流动注射进样法的酸效应干扰比蠕动泵进样法轻得多。另方面,三种进样法的化学干扰特点很相似。由此结果对ICP-AES中基体干扰的机理作了初步探讨,并得到了一些新结论。

Study on the Effects of Three Sample Feeding Devices on the Matrix Interterences in ICP-AES

Three sample feeding devices, namely FIA, peristaltic pump and pnuematic uptake have been used to examine their effects on the matrix interferences in ICP-AES. The acid mediumsselected were HC1, HNO_3,H_2 SO_4, H_3PO_4 and HCLO_4, and the tested elements were Ca, Co,Ni and Cu. The nesults showed that the FIA device could alleviate the acid effecte most effic-iently. However, the effects of PO_4~(3-), Al and Na matrices on Ca could not be alleviated by anyof the above mentioned devices. The mechanisms of these effects are discussed.