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1.1 ,These test methods cover the determination of hexavalent and total chromium in water. Section 34 on Quality Control pertains to these test methods. Three test methods are included as follows:
| Test Method | Concentration | Sections |
| A—,Photometric Diphenyl- | ,0.01 to 0.5 mg/L | ,7 –, 15 |
| B—,Atomic Absorption, | ,0.1 to 10 mg/L | 16 –, 24 |
| C—,Atomic Absorption, Graphite | ,5 to 100 μ,g/L | 25 –, 33 |