Study of elementary composition of chloroform extracts of dissolved organic matter from water of the Northwestern Indian Ocean has demonstrated that most of specimens have composition close to that of lipids, except that they have practically no nitrogen and phosphorus. Some of extracts have low carbon and hydrogen content. An assumption that low-polarity dissolved organic matter in such waters has lipid composition is not appropriate. It is shown that the proton magnetic resonance method is applicable for determining elementary composition of low-polarity dissolved organic matter.

Supplement to: Smirnov, M B; Bordovsky, Oleg K (1985): Structural group composition of chloroform extracts of dissolved organic matter in waters of the Northwest Indian Ocean. Oceanology, 25(4), 462-465