在ASTM E203用KF容量法测定水分的标准测定方法中有一句话: Some acids, such as formic, acetic, and adipic acid, are slowly esterified. For high accuracy with pyridine-based reagents, use 30 to 50 % pyridine in methanol as the solvent. When using pyridine-free reagents, commercially available buffer solutions16 can be added to the sample prior to titration. With formic acid, it may be necessary to use methanol-free solvents and titrants. 我想问一下,本句话中的"pyridine-based reagents"和"methanol-free"怎么理解会更加符合标准本意一些,谢谢啦!
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