难溶物质

其具有包裹难溶性物质而形成胶体的特点，是难溶且具有环境风险的有机物在水体中存在和转移的载体。

It has the characteristic of enwrapping insoluble substances and forming colloids , and so is the carrier of insoluble and environmental hazardous substances to exist and transfer in water body .

由于氢氟酸在酸洗过程中会产生难溶性的物质，且易挥发和产生爆炸，因此本试验最终选择盐酸作为酸洗溶液。

Not only pickling process would produce insoluble material under hydrofluoric acid but also hydrofluoric acid was easy to volatile and exploded . So hydrochloric acid was selected as the final pickling solution .

土壤中镉的二价离子在粘土衬层内的迁移过程中，可生成难溶性沉淀物质，阻碍了液体的渗透，因而导致渗透系数比纯水还低。

It is also found that the penetrating coefficient of bivalent cadmium in clay layer is less than that of pure water because during the migration bivalent cadmium forms precipitants and blocks liquid migration .

钙质岩土或碳酸盐类土，通常是指海洋生物（珊瑚、海藻、贝壳等）成因的、富含碳酸钙或其它难溶碳酸盐类物质的特殊岩土介质。

Calcium carbonate rock or soil , usually refers to special soil medium that marine life ( corals , algae , shells , etc. ) causes , rich in calcium carbonate or other insoluble substances .

在我国南海海域有着广泛分布的钙质砂是海洋生物成因、富含碳酸钙或其它难溶碳酸盐类物质的特殊岩土介质，具有与普通陆源砂完全不同的工程力学性质。

Calcareous sand , generated in marine environment and widely distributed in South China Sea , is a special geotechnical medium which has the different mechanical properties , compared with the land originated sand , due to its fabric .