A:Prices various according to periodic price changes of raw materials.Q6:What is your terms of payment ?A:Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shipment or based on BL copy or LC at sight.Q7:Do you provide custom made...
A:Prices various according to periodic price changes of raw materials.Q6:What is your terms of payment ?A:Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shipment or based on BL copy or LC at sight.Q7:Do you...
氯苯类污染物本文建立了超声波辅助萃取/固相萃取法-气质联用法(UAE/SPE-GS/MS)同时测定纺织固废物中17种氯苯类污染物的分析方法.从超声萃取溶剂,超声萃取时间,超声萃取温度和固相萃取小柱等前处理条件进行优化,以保留时间定性,外标法定量.结果表明,纺织固废样品在超声50℃的水浴中经二氯甲烷溶剂超声萃取30min后,再...
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