在无电镀镍浴中因次磷酸根氧化而产生的亚磷酸根离子，可以通过碱金属或碱土金属阳离子如钙的沉淀作用而去除。
Orthophosphite ions produced by oxidation of hypophosphite in an electroless nickel plating bath can be removed by precipitation with an alkali metal or alkaline earth metal cation such as calcium.
整天拿着剪刀和吹风机站着 是有代价的--手指有关节炎，腰部有钙沉淀，听力退化百分之十。
Standing all day and using scissors and a blow-dryer takes its toll—I have arthritis in my fingers, calcium deposits in my wrist, and 10 percent less hearing than I used to.
我们把过量的二氧化碳通入石灰水时，白色沉淀物会消失，因为沉淀物反应生成可溶于水的碳酸氢钙。
When we pass an excess of carbon dioxide into the limewater, the white precipitate disappears. This is because the precipitate dissolves to form soluble calcium hydrogencarbonate.
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