Spectrophotometric determination of dissolved organic carbon in some South Island streams and rivers (note)

Absorbance at 360 nm and dissolved organic carbon (DOC) concentration were measured on 47 filtered water samples collected from streams and rivers of the west coast of South Island, New Zealand. The regression equation (DOC (g m ‐3 ) = 59.6 Abs 1 cm + 1.9) calculated from the data, reliably predicted DOC concentration within the range 1.6–43.2 gm ‐3 . This relationship is similar to that found fsr some Venezuelan and south‐eastern United Stales waters indicating that it may have widespread utility for estimating DOC concentrations in soft waters where DOC is dominated by humic substances