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以壳聚糖为富集物，研究对水样中痕量Ｃｒ（Ⅵ）的分离富集作用－当试液为ｐＨ３－１０时，壳聚糖对Ｃｒ（Ⅵ）的富集效率最高，机械振荡５ｍｉｎ即可达到富集平衡，用０－１０ｍｏｌ／ＬＮａＯＨ洗脱，超声波振荡２ｍｉｎ达洗脱平衡，本法用于自来水中痕量Ｃｒ（Ⅵ）的测定，结果满意－
Chitosan was used as enrichment to study the separation and enrichment of trace Cr (Ⅵ) in water samples. When the solution was pH3-10, chitosan had the highest enrichment efficiency for Cr (Ⅵ) The equilibrium of enrichment can be achieved by shaking for 5min, eluted with 0-10mol / L NaOH and eluted with ultrasonic wave for 2min. The method is applied to the determination of trace Cr (Ⅵ) in tap water. The results are satisfactory -