How is the final concentration of a standard titrant solution determined?
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How is the final concentration of a standard titrant solution determined? 1. Calibration method: calibration is performed in 3 replicates, while verification is done in 2 replicates. How should the final result be determined? Is it the average of 3 parallels plus the average of 2 parallels, divided by two? Or something else? 2. With the direct preparation method, is it not necessary to run parallel tests?
1# Fish in water 1. Calibration method: calibration is performed in 3 repetitions, and the average of these 3 values is taken. The review involves 2 parallels, and the average of these 2 values is taken. 2. Direct preparation method, no need for replicates. After accurately weighing the standard sample, prepare it directly.
1\ I would like to ask what the final value indicated on the label of the standard solution is? Use the calibrated average? Is it still the average of the reviews? Or the average of the two averages? What exactly is that average value?
3# Fish in Water: Fill in the average value from calibration
This post was last edited by xwtsq on 2010-3-11 at 18:20. I wonder which standard requires the original poster to perform \"calibration for 3 parallels and verification for 2 parallels\"? GB/T601-2002 specifies “2 persons, 4 replicates each”, while HG/T 3696.1-2002 specifies “2 persons, 3 replicates each”. GB/T601 takes the average of eight parallel measurements. Although HG/T 3696.1 does not explicitly state \"take the average of the 6 parallel values for the two individuals\", it can be inferred from the context that this is indeed what is intended.
It was explained very clearly on the 5th floor – where does the requirement of “3 parallels for calibration and 2 parallels for verification” come from? When calibrating the concentration of the standard titration solution, two persons must conduct the experiment, with each performing four replicates. The relative value of the range of the four replicates done by one person shall not exceed 0.15% of the critical relative range for repeatability; the relative value of the range of the eight replicates done by both persons shall not exceed 0.18% of that critical value. The average of the results obtained from the eight replicates performed by both persons shall be taken as the final measurement result.