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.
该方法省去了灰化、酸溶等繁琐步骤，不但操作简便，而且灵敏度较高。
The proposed method was not only simple in handling without the steps of ashing and acid treatment, but also possessed high sensitivity.
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