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Reference solution (standard). Prepare as described for the
test solution, using the prescribed volume of lead standard
solution (10 ppm Pb) R instead of the substance to be
examined. To 10 ml of the solution obtained add 2 ml of the
test solution.
Monitor solution. Prepare as described for the test solution,
adding to the substance to be examined the volume of lead
standard solution (10 ppm Pb) R prescribed for preparation
of the reference solution. To 10 ml of the solution obtained
add 2 ml of the test solution.
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