1. The blank tube positive high sample itself is a positive sample, and the negative sample is replaced by a blank tube which is polluted in the experiment. In the experiment, the cause of cross-contamination water quality is prevented, and Wahaha mineral water is used instead.
2. The high addition amount is not accurate, the precise addition amount is not suitable for adding the concentration, and the appropriate concentration is added to take the liquid to dry more. The accurate liquid extraction is carried out to take other phase liquids, and the phase drying solution is required. Undiluted or added in small amount, correct diluted complex solution
3. Inaccurate addition amount is not accurate, accurate addition amount is not suitable for adding concentration, adding appropriate concentration to take liquid to dry less, accurate liquid extraction and drying solution dilution error or addition amount, correct dilution complex solution
ZGAR FILTER TIP
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