chapter  3
3 Pages


The laboratory must have the instruments and equipment needed to perform the approved methods for which certification has been requested. The checklist on page 43 of this chapter provides more information on the necessary equipment. All instruments should be properly maintained and calibrated.

4.1.1. Chemicals=Reagents: Chemicals and reagents used must meet the specifications in the method. If not specified, then ‘‘analytical reagent grade’’ (AR) or American Chemical Society (ACS) grade chemicals or better should be used for analyses in certified laboratories. Consult Standard Methods for the Examination of Water and Wastewater, 18th Edition, part 1070 for more detailed information on reagent grades.