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1 mg, and the samples at room temperature could be preserved for 15 days at least. Ethylenediamine, triethylenetetramine or tetraethylenepentamine coexisted in the air did not interfere during the determination of diethylenetriamine. CONCLUSION The method with low determination concentration, high accuracy and precision, is feasible for determination of diethylenetriamine in workplace air.OBJECTIVE The method for analyzing of 20 polychlorinated biphenyls(PCBs) in water by stable isotope internal standard-automatic solid-phase extraction me
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