硫酸镁溶液是临床上常用的容积性泻药和利胆剂,由于原料中存在一些金属杂质,致使溶液在存放期间常析出沉淀而影响使用,本文选用ICP分析原料中金属杂质含量入手,认为引起沉淀的主要原因是溶液中Al~(3+)t和Fe~(3+)的存在,向溶液中加入适量的枸橼酸钠或EDTANa_2作络合剂,取得良好效果,并认为以选用枸橼酸钠较合理,有一定推广价值。 Magnesium sulfate solution is commonly used in clinical volume of laxatives and gallbladder, due to the presence of some metal impurities in raw materials, resulting in the solution precipitation during deposition often affect the use of precipitation, the choice of ICP analysis of metal impurities in the starting material, that is caused by precipitation Is mainly due to the existence of Al ~ (3 +) t and Fe ~ (3 +) in the solution. Adding appropriate amount of sodium citrate or EDTANa_2 to the solution as a complexing agent achieves good results. It is considered that the use of citron Sodium is more reasonable, there is a certain promotional value.