Preparation method and condition of stability of chloral hydrate sample are studied in this paper.Then effective method which can keep standard solution and standard sample for long time is selected.

• 对水合三氯乙醛水质样品的制备及稳定性条件进行了研究,进而选择出了可长时间保存水合三氯乙醛标准溶液和标准样品的有效适宜方法。