Journal of Oceanography, Vol. 48 (No. 3), pp. 283-292, 1992
Kazuo Abe and Yasunori Watanabe
Seikai National Fisheries Research Institute, 49 Kokubu-cho, Nagasaki 850, Japan
(Received 4 January 1992; in revised form 23 March 1992; accepted 31 March 1992)
Abstract: Inductively Coupled Plasma Atomic Emission Spectrometry (ICP) was adopted for direct analysis of silicate in seawater, eliminating necessity for pre-treatment. Via this method, the determination of silicate is rapid and easy compared with conventional methods of colorimetry. In seawater analysis, a decrease of sensitivity of about 24% was observed due to interference by coexisting elements, mainly Na. Examination of the analytical conditions revealed a detection limit of 0.3 mM Si, and precisions of approximately 3.2, 2.0 and 1.3% for Si levels of 4, 15 and 94 mM, respectively. Using this method, silicate determination in the East China Sea was attempted.