1. State Bureau of Environmental Protection and the Edition Board of Water Monitor Analytic Approach (1989) The Analytical Method of Water and Waste Water Monitoring. China Environmental science Press, Beijing, p 260
2. Sulaiman ST, Akrawi BAN (1984) Analyst 109:1545
3. Jiang ZL (1998) Talanta 46:1038
4. Montes R, Laserna JJ (1987) Talanta 34:226
5. Zai WA, Cao NC (1985) Chin J Anal Chem 13:708