With DDTC (copper reagent) -photometry mensuration the trace copper in Soy sauce, have studied DDTC the condition with the copper reaction of colour developing.
采用DDTC(铜试剂)-光度法测定酱油中的微量铜，研究了DDTC与铜显色反应的条件。
2
Trace lead in baked food is determined by air-acetylene flame atomic absorption spectrometry (FAAS) with APDC-DDTC-MIBK as the extraction and preconcentration system after cineration process.