补充 popo:
二次亚沸(甚至三次亚沸) 蒸馏出的HNO3,只能逐级削弱HCl,不能彻底消除HCl。因为HNO3与HCl蒸气分压服从拉乌尔定律。
即便样品消解时不用HCl、只用HNO3,终产物还是会有一点氯离子的,这一点点40Ar35Cl对75As的贡献不可小视。
如果加一些乙醇,则有助于标准曲线法下的75As测定。具体可参考这篇文章
Hu, Z. C., Gao, S., Hu, S. H., Yuan, H. L., Liu, X. M., and Liu, Y. S., 2005.
Suppression of interferences for direct determination of arsenic in geological samples by inductively coupled plasma mass spectrometry.
Journal of Analytical Atomic Spectrometry 20, 1263-1269.
http://www.rsc.org/Publishing/Journals/JA/article.asp?doi=b507200j补充 tuxlin:
SPECTRO是一台神机!4800个多道离子计数器,很适合同位素测定。
An extremely powerful Direct Charge Detector with 4,800 channels is placed in the focal plane of the mass spectrometer recording simultaneously the entire mass spectrum from lithium to uranium with an average of 20 channels per isotope
http://www.spectro.com/pages/e/p060124_New_Era_in_ICP_Mass_Spectrometry.htm补充 yzyxq:
高分辨市场有 美国Thermo公司的Element II 和 英国Nu公司的Attom