PORE WATER SAMPLING METHOD FOR SULFIDE MEASURING IN SEDIMENT

Abstract

 The concentration of sulfide contained in the bottom sediment is important as an indicator of environmental pollution in enclosed coastal seas. Acid-Volatile sulfide (AVS) is widely used as an index of this sulfide concentration in Japan. However, AVS contains a large amount of sparingly soluble bound sulfides that have little effect on living organisms. Therefore, it is considered that the accuracy is low as an environmental index for evaluating the effect on living organisms. On the other hand, there are few measurement examples of dissolved sulfide because it is difficult to collect and analyze many samples in short time . We have devised a method to easily collect pore water from sediments and analyzing the dissolved sulfides contained in this pore water . The accuracy of this analysis method was examined and it was confirmed that sufficiently practical measured values could be obtained. As a result of comparing dissolved sulfide with conventional AVS at the survey site of Hakata Wan enclosed coastal sea by this method, it was found that the dissolved sulfide concentration is a highly independent index different from AVS and is an effective index for evaluating environmental pollution.