Inorganic Carbonate Elimination from Water Samples for Dissolved Organic Carbon Analysis

Abstract

Inorganic carbonate is eliminated by passing CO2 and organic free air through acidified samples for DOG analysis. The air is supplied from a manual rubber air pump by way of two gas washing bottles containing concentrated sulfuric acid and 1N-NaOH and a sodalime tube. The precision of the present method is the same as that of the standard method, which removes inorganic carbonate by high quality nitrogen gas supplied from a high pressure nitrogen gas tank. The present method is especially useful in remote areas such as alpine lakes.