Method:The samples were pulverized and suspended in agar sol.Test solutions were prepared by adding CaCl2 solution in appropriate amounts of the suspension to eliminate chemical interference.

• 方法：将样品粉碎、悬浮在琼脂胶体中制成悬浮液，取适量样品悬浮液配制成试液，在试液中加入钙盐溶液以消除化学干扰。