离子杂质 meaning in English

ionic contaminant
ionic impurity

Methods of test for determination of ionic impurities in electrical insulating materials by extraction with liquids
用液体萃取法测定电绝缘材料中离子杂质的试验方法
Methods of test for the determination of ionic impurities in electrical insulating materials by extraction with liquids
测定电气绝缘材料中离子杂质的液体萃取试验方法
Methods of testing insulating materials . methods of test for the determination of ionic impurities in electrical insulating materials by extraction with liquids
绝缘材料的测试方法.用液体萃取法测定电绝缘材料中离子杂质的试验方法