標(biāo)準(zhǔn)編號:	GB/T 223.61-1988
中文名稱:	鋼鐵及合金化學(xué)分析方法 磷鉬酸銨容量法測定磷量
英文名稱:	Methods for chemical analysis of iron, steel and alloy; The ammonium phosphomolybdate volumetric method for the determination of phosphorus content
中標(biāo)分類:	H11    鋼鐵與鐵合金分析方法
行業(yè)分類:	GB    國家標(biāo)準(zhǔn)
ICS分類:	77.080 77.080    黑色金屬 77.080
發(fā)布機構(gòu):	中華人民共和國冶金工業(yè)部
發(fā)布日期:	1988-2-5
實施日期:	1989-2-1
標(biāo)準(zhǔn)狀態(tài):	valid
替代舊標(biāo)準(zhǔn):	GB 223.3-1981
翻譯語言:	英文
文件格式:	PDF
中文字符數(shù):	5,000 字
翻譯價格(元):	200.0
交付時間:	付款后 1 個工作日

1 Principle Dissolve the sample with oxidizing acid; at nitric acid acidity of 2.2mol/L, add ammonium molybdate to generate ammonium phosphomolybdate deposition; after filtering, dissolve with excessive standard sodium hydrate solution; taking dihydroxyphthalophenone solution as indicator, back-titrate the excessive sodium hydrate with dihydroxyphthalophenone solution till the pink just disappears (the end point) (about pH8). The general reaction formula of dissolving ammonium molybdate precipitation with sodium hydrate is as: (NH4)2H(PMo12O40)?H2O+240H-=HPO +12MoO +2NH +13H2O Arsenic of less than 100μg, tantalum <500μg, zirconium, vanadium or niobium <1mg, wolfram <8mg, titanium < 10mg and silicon < 20mg contained in the test solution, may not interfere the determination; exceeding the limits above, remove arsenic by hydrochloric acid and hydrobromic acid; mask zirconium, niobium, tantalum, titanium and silicon by fluohydric acid; reduce vanadium by hydroxylamine hydrochloride; remove wolfram (in ammonia solution at presence of EDTA) by beryllium carrier. 2 Reagents