黄河口及其附近海域沉积物中As的粒度校正(Ⅱ)

GRAIN-SIZE EFFECT CORECTION OF ARSENIC IN YELLOW RIVER ESTUARY AREA SEDIMENTS (Ⅱ)

本文着重讨论利用沉积物外比表面校正法对黄河口及其附近沉积物中As进行粒度校正,并与上文讨论的≤16μm粒径外推校正法及中值粒径校正法进行了比较,结果外比表面法被认为是较为合理的。同时还提出利用单位外表面积沉积物活性As含量作为沉积物中As的评价标准,并可以推广到沉积物中其他污染物质的研究中去。

Extra specific surface area correction is discussed and compared with other two methods,≤16μm extrapolation from grain-size distribution and median diameter in sediments in this paper. Specific surface area method shows more advantages over the other two.The ratio of 'active' As in water (g)/extra surface area in m2 is a constant because of the excellent correlation between the extra specific surface area and the contents of 'active' As (1M-HCL extractable) in uncontaminated sediments from the same origin. This constant can be used in assessing As contents and may be also valid for other heavy metals in evaluating marine enviorment qualities and making marine sediment criterion of standards.