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6. Precision control and assurance
See Fig. 1
for an overview.
Record the operations as follows. If any item to be recorded
lacks, specify the reason and, if possible, remove the cause and
retry the operation.
1) Establish a standard analytical procedure.
2) Sampling: Record the date and location of sampling,
operator's name, containers for sampling, sampling methods,
containers for transport and storage, and method of storage.
3) Sample check and acceptance at laboratory: Record the date
and location of sample check, operator's name, transportation
method, state of the sample, place and method of storage, and
control number. if a transport service is employed, keep a copy
of the invoice.
4) Reagents: Record the manufacturer's name, product name, lot
number, purity, shelf life, date of purchase, and supplier's
name of the standard samples and reagents used. For reagents
prepared in the laboratory, record the situation, including the
date and place of preparation, operator's name, and history of
use.
5) Instruments: Keep records of use (environments and
conditions), routine maintenance, sensitivity (evidences of the
required sensitivity in specific measurements, e.g.
chromatograms), inspection and repair.
6) Analysis: Record the date, place and environment of each
analytical step, operator's name, name and quantity of the
sample analyzed, order of measurement, and name and quantity of
reagents used.
7) Record the final solvent blank, entire operation blank, and
repetitions (from one and the same vial or from sampling).
8) Isotope ratio of the standard sample for measurements
involving isotopes: Record an evidence that the response ratio
of the two monitor ions for each compound in the standard
samples measured is in agreement with the theoretical value. The
experimental ratio should be within ±30% of the theoretical
ratio.
9) Chromatograms: Keep chromatograms related to standard
solutions, final solvent blanks, entire operation blanks and
samples.
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