ISO 9438-1993 冶金性荧石磷总含量的测定还原磷钼酸盐光谱法

作者:标准资料网 时间:2024-05-17 20:43:52   浏览:9060   来源:标准资料网
下载地址: 点击此处下载
【英文标准名称】:Metallurgical-gradefluorspar;determinationoftotalphosphoruscontent;reduced-molybdophosphatespectrometricmethod
【原文标准名称】:冶金性荧石磷总含量的测定还原磷钼酸盐光谱法
【标准号】:ISO9438-1993
【标准状态】:作废
【国别】:国际
【发布日期】:1993-04
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC175
【标准类型】:()
【标准水平】:()
【中文主题词】:含量测定;磷;萤石;光谱测定法;磷含量;化学分析和试验;矿物;冶金工业
【英文主题词】:Chemicalanalysisandtesting;Determinationofcontent;Fluorspar;Metallurgicalindustry;Minerals;Phosphorus;Phosphoruscontent;Spectrometry
【摘要】:Theprincipleofthemethodspecifiedistodecomposeatestportionbyalkalinefusionandsubsequentdissolutionofthemeltinexcessofnitricacid,precipitationofiron(III)phosphatewithammoniasolution,dissolutionoftheprecipitateinnitricacid,formationofthemolybdophosphatecomplexandextraction,followedbyselectivereductionofthecomplextomolybdenumblue,spectrometricmeasurementoftheabsorbanceofthecolouredcomplexatthewavelengthofmaximumabsorption(about710nm).Appliestoproductshavingtotalphosphoruscontents,expressedasPO,intherange0,01%(m/m)to1,0%(m/m).
【中国标准分类号】:D52
【国际标准分类号】:73_080
【页数】:6P;A4
【正文语种】:英语


下载地址: 点击此处下载
MIL-N-45938, MILITARY SPECIFICATION: NUT, PLAIN, CLINCH AND NUT, SELF-LOCKING, CLINCH, GENERAL SPECIFICATION FOR (30 SEP 1971) [S/S BY NASM45938]., This specification covers the requirements for nuts which are permanently attached to a structure by pressing the nut shank or collar into a single hole. Anti-rotation and push-out resistance results from cold flow of the structure material into the shank or collar of the nut, or the flaring over the nut shank.MIL-STD-1682-5 (NOTICE 1) SHIPYARD INSPECTION AND CLEANING PROCEDURES FOR SUBMARINES. MIL-STD-1682/5(SH), dated October 1976, is herby canceled without replacement.