The pre-treatment of them before conventional cyanide leaching includes roast, chemical oxidation and biological oxidation.
在传统氰化浸出之前进行的预处理过程包括焙烧，化学氧化和生物氧化。
2
The experiment results show that the new method is a simple and efficient method for direct detection of trace drug, toxicant and their metabolites in biological samples without sample pre-treatment.