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应用Al-CAS-OP和Al-CAS-CPB三元胶束测定样品中微量铝的方法都有报道,但同时引入OP和CPB进行增敏的混合胶束体系未见应用。为此,我们系统地研究了该体系的反应条件。试验表明,混合胶束比单一胶束灵敏度高、酸度范围宽,问题是基体Fe~(3+)的干扰严重。常用的掩蔽剂如抗坏血酸、EDTA-Mn、CyDTA-Cd等都不能掩蔽。第二是混合胶束在pH6.7左右形成,没有合适的缓冲剂。为了解决上述问题,本文首先用CyDTA-Mn掩蔽大量铁,然后用乙二胺-盐酸缓冲溶液控制pH取得了成功。特别是乙二胺兼有很强的掩蔽作用,由于乙二胺的存在,50ml显色液内Ni~(2+)、Cu~(2+)、Co~(6+)等离子的允许量提高了几十倍,其中Ni~(2+)的允许量提高到3mg,使方法具有选择性好、简便、准确的优点。
There are reports on the methods of determination of trace aluminum in Al-CAS-OP and Al-CAS-CPB ternary micelles. However, the mixed micellar system with OP and CPB sensitization has not been applied. To this end, we systematically studied the reaction conditions of the system. The experimental results show that the mixed micelles are more sensitive than single micelles and have a wide range of acidity. The problem is that the interference of Fe 3+ in the matrix is serious. Common masking agents such as ascorbic acid, EDTA-Mn, CyDTA-Cd, etc. can not be masked. The second is that the mixed micelles are formed around pH 6.7 with no suitable buffer. In order to solve the above problems, this paper first masked a large amount of iron with CyDTA-Mn, and then succeeded in controlling the pH with ethylenediamine-hydrochloric acid buffer solution. In particular, ethylenediamine has a strong masking effect. Due to the presence of ethylenediamine, the allowable amount of Ni 2+, Cu 2+ and Co 6+ ions in 50 ml of the color developing solution is increased A few times, in which Ni ~ (2+) allows the amount increased to 3mg, the method has the advantages of good selectivity, simple and accurate.