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近年来,在按照现行海洋调查规范进行沉积物化学成分分析时常遇到下述几个问题,现归纳如下,与大家商榷。 首先,海洋沉积物化学分析试样是在船上直接烘干或带回湿样经干燥后进行成分测试。因此,随着沉积物类型的差异及采样方式的不同,试样中所夹带的海水体积也就不同。在试样干燥过程中,随着水分的蒸发,海水中盐类的析出,从而沉积物被稀释。由于海水的主要成分(主要是钠盐、镁盐)的引入,使沉积物中Na、Mg、Ca、K等的分析结果相应偏高。同时,使得沉积物主要成分(如Si、Al、Fe、H_2O等)的分析结果相应偏低。这种现象均是由于按现行海洋调
In recent years, following the analysis of chemical composition of sediments in accordance with the current marine survey norms, they often encounter the following problems, which are summarized as follows, to discuss with you. First, samples of chemical analysis of marine sediments are either directly dried on board or taken back to a wet sample and dried to allow component testing. Therefore, the volume of seawater entrained in the sample varies with different sediment types and sampling methods. In the sample drying process, with the evaporation of water, salt precipitation in seawater, so the sediment is diluted. Due to the introduction of the main components of seawater (mainly sodium and magnesium salts), the analysis results of Na, Mg, Ca and K in sediments are correspondingly high. At the same time, the analysis results of the main components of sediments (such as Si, Al, Fe, H_2O, etc.) are correspondingly low. This phenomenon is due to the current marine tune