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Product Code:SAE J1849
Title:Emergency Vehicle Sirens
Issuing Committee:J1849 Emergency Vehicle Siren Task Force
Scope:This SAE Recommended Practice provides laboratory test procedures, requirements, and guidelines for electronic sirens systems with a single loudspeaker, and electromechanical sirens for use on authorized emergency vehicles, which call for the right-of-way. This document is applicable only to such sirens that have all dimensions across the sound-emitting opening equal to or less than 0.5 . Test procedures and performance requirements for individual system components are not included in this version.【英文标准名称】:Metallurgical-gradefluorspar;determinationofleadcontent;solventextractionatomicabsorptionspectrometricmethod
【原文标准名称】:冶金性荧石铅含量的测定溶剂萃取原子吸收光谱法
【标准号】:ISO9779-1993
【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】:冶金工业;铅含量;光谱测定法;含量测定;铅;萤石;原子吸收分光光度测定法;化学分析和试验;矿物
【英文主题词】:Atomicabsorptionspectrophotometry;Chemicalanalysisandtesting;Determinationofcontent;Fluorspar;Lead;Leadcontent;Metallurgicalindustry;Minerals;Spectrometry
【摘要】:Theprincipleofthemethodspecifiedistodecomposeatestportionbyamixtureofnitric,hydrofluoricandperchloricacids,dissolvingthesaltsinhydrochloricacidafterevaporationtodryness,extractingtheleadfromadilutehydrochloricacidsolutionofthedecomposedtestportionintoasolutionoftri-n-octylphosphineoxidein4-methyl-2-pentanone,aspiratingtheextractintotheair/acetyleneflameofanatomicabsorptionspectrometer,andmeasuringtheabsorbanceat283,3nm.Appliestoproductshavingleadcontentsintherange0,0006%(m/m)to0,01%(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