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本文提出了在低浓度(～1—10mgl~(-1))下测量盐水中细粒沉积物的沉降速度的一种新方法。这种方法运用科尔特(Coulter)计数器将常规的沉降管法与等分体积测量结合在一起。科尔特计数器在体积测量中的灵敏性,使得沉降管实验可在测定期间足以阻止凝聚作用发生的各种颗粒浓度下进行。这种方法已应用于初始浓度为1.6—600ppm 的北太平洋粘土样。实验结果通过沉降分布差异表明,凝聚效应在浓度低至50ppm 之时仍有发生。在清水中进行的实验则证实,在更低的浓度下,不再发生凝聚。
This paper presents a new method for measuring the sedimentation rate of fine-grained sediments in brine at low concentrations (~ 1-10 mg l -1). This method uses a Coulter counter to combine conventional settling tube methods with aliquot volume measurements. The sensitivity of the Coulter counter in volumetric measurements allows settling tube experiments to be performed at various particle concentrations sufficient to prevent cohesion from occurring during the assay. This method has been applied to North Pacific clay samples with an initial concentration of 1.6-600 ppm. The experimental results show that the difference in sedimentation distribution indicates that the cohesive effect still occurs at concentrations as low as 50 ppm. Experiments in clean water confirmed that at lower concentrations no agglomeration occurred.