Originally posted by zlongz120 at 2011-01-07 18:18:09:
食用油的酸值都测到了60-70？
仔细审查一下你的检测过程，肯定哪里错了。

Originally posted by 杨萍 at 2011-01-08 09:12:00:
[quote]Originally posted by y34w at 2011-01-07 16:48:42:
算不算油脂我不知道，不知道你浸提的是什么膏。但是颜色深的话有两种解决办法，一个是调小取样量，另外一个是增加溶剂的量，我在实验室做的时 ...

Originally posted by zlongz120 at 2011-01-08 10:16:06:


你那个膏主要成分应该是属于蜡一类的物质吧？是先溶于有机溶剂（比如二甲苯等）中，然后再用氢氧化钠-乙醇溶液滴定吗？

[ Last edited by zlongz120 on 2011-1-8 at 10:29 ]

Originally posted by 杨萍 at 2011-01-09 11:44:31:

用乙醇溶的

Originally posted by zlongz120 at 2011-01-09 11:54:59:


最好用非极性溶剂。油脂虽说可以溶于乙醇，但其他有些极性非油脂类的物质也能溶于乙醇

Originally posted by 杨萍 at 2011-01-09 14:29:24:

我按照方法的做，也不知道可以用其它溶剂溶，我的指示剂和溶液都会分层

Originally posted by zlongz120 at 2011-01-09 15:16:53:

建议换一下溶剂