In the past twenty years, the use of solid phase extraction techniques has become increasingly popular for separation and preconcentration of trace elemens in environmental samples.
在过去的二十年中，利用固相萃取技术从环境样品中萃取分离富集痕量重金属离子越来越受到人们的重视，应用日益广泛。
In the past twenty years, the use of solid phase extraction techniques has become increasingly popular for separation and preconcentration of trace elemens in environmental samples.
在过去的二十年中，利用固相萃取技术从环境样品中萃取分离富集痕量重金属离子越来越受到人们的重视，应用日益广泛。
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