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★ ★ agoody(金币+2,VIP+0):xiexie!
Potassium hydrogen phthalate (KHP) standard, HOOCC6H4COOK: Lightly crush and then dry KHP to constant weight at 110°C. Dissolve 425 mg in distilled water and dilute to 1000 mL. KHP has a theoretical COD1 of 1.176 mg O2/mg and this solution has a theoretical COD of 500 µg O2/ mL. This solution is stable when refrigerated, but not indefinitely. Be alert to development of visible biological growth. If practical, prepare and transfer solution under sterile conditions. Weekly preparation usually is satisfactory.
感觉有点约定俗成的意味,TOC的标准也是用它。“模式化学药品”???
[ Last edited by kxli on 2008-10-28 at 13:26 ] |
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