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采用微量水的盐酸胍法分析天然光卤石（ＫＭｇＣｌ＿３·６Ｈ＿２Ｏ）中不同脱水形式结晶水的氧同位素组成，以研究不同形式存在的结晶水对氧同位素的富集效应。结果表明，不同存在形式的结晶水对氧同位素的富集程度不同，而且差异明显。
The oxygen isotope composition of different dehydrated forms of crystalline water in the natural carnallite (KMgCl_3 · 6H_2O) was analyzed by the guanidine hydrochloride method with a trace amount of water to study the enrichment effect of different forms of water on the oxygen isotopes. The results show that different forms of water have different oxygen isotope enrichment, and the difference is obvious.