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nature : often refers to water or ordinary salt (NaCl) solution. Usually the sea water soluble salt content of 35,000 mg / L (3.5%), including 20,000 mg / L chloride, mainly ordinary salts, and there are also other kinds of brine, some of which contain dissolved salt 300,000 mg / L, respectively. ASTM31 definition saline content of dissolved substances than 30,000 mg / L of water.
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