Appendix 4: Vehicle Use List

methyl red endpoint (pH 4.3-5.1). 1.3 Health and Safety Warnings. The titrant acid used with this procedure is sulfuric acid (H2SO4). The normality of the acid varies, but 1.6 N and 0.16 N are the commonly used concentrations in the Hach procedure. Sulfuric acid in these concentrations can cause irritations and burns. ................
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