沉积物粘土混浊水电导率与pH值相关性研究——以渤海湾西岸平原XZ、MD钻孔为例

对渤海湾西岸平原XZ、MD钻孔样品的粘土混浊水电导率(以下简称EC)和pH测定值进行相关分析,结果显示EC与pH都呈高度负相关,两孔的相关系数分别为-0.830(P P r=0.089,P >0.05)外,其他各沉积带均显示较明显的负相关.但负相关性也有所不同,XZ孔海陆过渡相沉积带(Ⅱ带,r=-0.740,P r=-0.434,P r=-0.403,P r=-0.482,P <0.05)也有较明显的负相关性.这表明沉积物EC与pH相关程度的差异,亦可在一定程度上反映出其沉积环境的不同.

THE CORRELATION BETWEEN ELECTRIC CONDUCTIVITY AND pH OF THE STICS-WATER: A CASE STUDY OF CORES XZ AND MD ON THE PLAIN OF WEST BOHAI BAY

The electric conductivity of stirred clayey sediments into water(STICS-water) is a substitute index which has been newly used in identifying sedimentary layers in the plain of west Bohai Bay, which is an ideal region for the study of Quaternary sediments. Some papers discussed that pH was negatively correlated with EC, therefore, pH could be regarded as an auxiliary index. However, further research in this topic is still under discussion, especially the detailed researches on the correlation between EC and pH in different sedimentary facies. Based on the correlation between EC and pH of sediments of core XZ (38°56'30.3"N, 117°28'05.1"E) and core MD(38°59'16.1"N, 117°15'37.4"E) on the plain of west Bohai Bay, we discussed that EC was significantly negatively correlated with pH for core sediments, with the correlation coefficients of -0.830(P P r=-0.403, P r=-0.740, P r=-0.482, P r=-0.434, P r=0.089, P >0.05). The results show that the differences of correlation between EC and pH of sediments is able to partly reflect the variational sedimentary environments.