TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 48 (No. 3), pp. 283-292, 1992

Determination of Silicate in Seawater by Inductively Coupled Plasma Atomic Emission Spectrometry

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.


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