方法：采用四苯硼钠法检测并增加阴性对照管及试剂对照管，取消炭化灰化的步骤。
Methods:To test it with sodium tetraphenylborate method increasing negative control and the control of reagent and cancel carboration ash steps.
方法：采用四苯硼钠法检测并增加阴性对照管及试剂对照管，取消炭化灰化的步骤。
Methods:To test it with sodium tetraphenylborate method increasing negative control and the control of reagent and cancel carboration ash steps.
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