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10) Calculations
- Calculation process: Keep records that permit to trace the
entire process of calculations ranging from sampling to the
analyte concentration, including standard solution
concentration, quantity of the internal standard added, area
measured on the instrument, etc.
- Recovery ratio: Check and record the recovery ratio, which
should preferably be in a range of 70 to 120%.
11) Blank tests
- Perform blank tests for the sampling tools and containers for
sampling, transportation and storage. Record the results.
- Perform blank tests for reagents every time a reagent of a new
lot number is used. Record the results.
- Entire operation blank: Perform a blank test in the same way
as in the analysis of the sample. Record the results.
12) Repetition: It is desirable to perform more than one time
the analysis for ten samples. The results of the repeated
measurements should preferably be in agreement within a range of
±30%. (This does not apply to analytes for which the observed
concentration is lower than ten times the target detection
limit.)13) Intercalibration with other laboratories is recommended.
7. Miscellaneous
See also the Guidance for Operations in Food Sanitation
Laboratories established according to the Food Sanitation Act.
See also "Feed Analysis 2004", Japan Scientific Feeds
Association [in Japanese]
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