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采用ＨＰＬＣ的阀切换二次分离及梯度洗提技术对硫－氨溶液中的主要成分Ｈ２ＮＳ－４进行研究，证明其在液氨中的分解是经过中间过渡产物Ｓ３Ｎ－和Ｓ－３然后生成Ｓ４Ｎ－，最终达到平衡．
The main component H2NS-4 in the sulfur-ammonia solution was studied by HPLC-based valve switching secondary separation and gradient elution. It was proved that the decomposition of H2NS-4 in liquid ammonia was through intermediate intermediate products S3N- and S-3 and then to S4N -, eventually reaching equilibrium.