That is, the 10 indicators in Table 1 must meet the standards. 2, it should be said that the Arbitration Law and the arsenic stain method are highly accurate, you can request re-testing. If there is still a lot of deviation, you can find another good quality testing unit, the reason why the original standard hydride atomic fluorescence method into these two methods, Shandong Lu net Chemical Co., Ltd., Shenzhen Qingyuan Water Purification Equipment Co., Ltd. Are relatively strong product quality units 1, compulsory standards must be implemented (reach), recommended standards do not require the need to achieve (may not be reached), or find the Technical Supervision ruling. 4, drafting units such as Taicang Nova Light Additives Factory, is to improve the measurement accuracy. So not suitable for the original method instead. 3, the reasons for the large gap is generally detected improper operation, or instrument problems