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尝试使用电导法测定黄土-古土壤序列中的易溶盐总量.着重考察配制溶液时的水土比例、溶解时间等具体实验条件对测试结果的影响.当水土比固定时,若溶解时间增加,电导率也随之增加;溶解时间固定时,随着水土比的增加,电导率则逐渐降低.水土比变化对电导率测量值的影响较震荡时间更高,是最重要、需要最先确定的实验条件.为了尽可能保证易溶盐溶解、避免难溶盐参与溶解,建议测定黄土-古土壤序列电导率时,使用5∶1的水土比;选择至少10 min的震荡时间,30 min为最优.若样品年代较早,或地理位置偏东南,则建议更长的震荡时间.
Try to use the conductivity method to determine the total amount of soluble salts in the loess-paleosol sequence.The effects of specific experimental conditions such as soil-water ratio and dissolution time on the test results were investigated.When the water-soil ratio is fixed, if the dissolution time increases, The conductivity increases with the increase of water-soil ratio when the dissolution time is fixed, and the change of water-soil ratio is more important than the oscillation time in the measurement of conductivity, which is the most important and needs to be determined first Experimental conditions In order to ensure the dissolution of soluble salts as much as possible and avoid the dissolution of insoluble salts, it is recommended to determine the conductivity of loess-paleosol sequences using a ratio of water to soil of 5: 1, to select the oscillation time of at least 10 min for 30 min If the sample is older, or geographically southeast, it is recommended longer shock time.