AOAC Official Method 892
|
ID： |
AC31F7A4E37144A69575334C62E100A5 |
|
文件大小(MB)： |
0.17 |
|
页数： |
1 |
|
文件格式： |
|
|
日期： |
2024-7-31 |
|
购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
2.4.10,AOAC Official Method 892.01,Nitrogen (Ammoniacal and Nitrate),in Fertilizers,Devarda Method,First Action 1892,Final Action,(Not applicable in presence of organic matter, calcium cyanamide,and urea.),Place 0.35 or0.5 g sample in 600-700 mL flask and add 300 mL,H2O, 3 gDevarda alloy (Cu 50, Al 45,Zn 5), and 5 mL NaOH solution,(42% by weight), pouring latter down side of flask so that it does,not mix at once with contents. By means ofDavisson [J. Ind. Eng.,Chem. 11,465(1919)] or other suitable scrubbing bulb that will prevent,passing over of any spray, connect with condenser, tip of which,always extends beneath surface of standard acid in receiving flask.,Mix contents of distilling flask by rotating. Heat slowly at first and,then at rate to yield250 mL distillate inlh. Collect distillate in measured,amount standard acid, 955.04A(j)(see 2.4.03),and titrate with,standardNaOH solution, 955.04A(k)( see 2.4.03), using methylred,955.04A(i) (see 2.4.03).,References: Chem. Ztg. 16, 1952(1892).,JAOAC 6, 391(1923); 15,267(1932).,. 2000 AOAC INTERNATIONAL……
……