標準編號:	GB/T 223.20-1994
中文名稱:	鋼鐵及合金化學分析方法 電位滴定法測定鈷量
英文名稱:	Methods for chemical analysis of iron steel and alloy.The Potentiometric titration method for the determination of cobalt content
中標分類:	H11    鋼鐵與鐵合金分析方法
行業分類:	GB    國家標準
ICS分類:	77.080 77.080    黑色金屬 77.080
發布機構:	國家質量監督檢驗檢疫總局
發布日期:	1994-1-17
實施日期:	1994-10-1
標準狀態:	valid
替代舊標準:	GB 223.20-1982 鋼鐵及合金化學分析方法 電位滴定法測定鈷
翻譯語言:	英文
文件格式:	PDF
中文字符數:	4000 字
翻譯價格(元):	280.0
交付時間:	付款后 1 個工作日

1 Subject Content and Application Scope This Standard specifies a method for the determination of the cobalt content using a potentiometric titration method. This Standard is applicable to the determination of cobalt content in alloy steel, high temperature alloy and precious alloy. Determination range: above 3.00%. 2 Principle Cobalt is oxidized using potassium ferricyanide in the ammoniacal medium in the presence of ammonium citrate and excessive potassium ferricyanide is subject to back titration with cobalt sulfate standard solution. No more than 30 mg of chromium, 5mg of copper and 3mg of manganese in the titrated solution has no influence on its determination.