Abstract
Chemical techniques for studying chemical state of selenium in sediments are described. Selenium is leached from the sediments by shaking with acid and/or alkaline solutions. Chemical state of selenium in the sediments is inferred from the distribution of the element as well as of the indicator substances, such as iron and aluminum, in the separate fractions. A new leaching experiment on the sediments by the irradiation of ultrasonic wave is also investigated. This method is more convenient and effective for the state analysis of trace elements in the sediments.
