A.乙腈+甲醇+2%乙酸B.乙腈+甲醇+1%乙酸C.乙腈+2%乙酸D.甲醇+2%乙酸
A.最低B.最高C.中等D.偏大
A.在農(nóng)藥殘留分析操作各個(gè)步驟中,以濃縮對(duì)農(nóng)藥損失最大B.濃縮時(shí),應(yīng)將溶劑蒸干,提高回收率C.對(duì)于穩(wěn)定性差的農(nóng)藥,濃縮時(shí)應(yīng)減壓降溫D.通常濃縮時(shí),可添加不干擾分析的蒸干抑制劑來防止溶劑蒸干