分析试验室
分析試驗室
분석시험실
ANALYTICAL LABORATORY
2010年
4期
41-44
,共4页
普旭力%王鸿辉%叶淑爱%董清木%朱桂容%王彩云%魏丽英
普旭力%王鴻輝%葉淑愛%董清木%硃桂容%王綵雲%魏麗英
보욱력%왕홍휘%협숙애%동청목%주계용%왕채운%위려영
钨精矿%X射线荧光光谱法%内标法%熔融制样
鎢精礦%X射線熒光光譜法%內標法%鎔融製樣
오정광%X사선형광광보법%내표법%용융제양
Tungsten concentrate%X-ray fluorescence spectrometry%Internal standard%Fusion sampling
提出了以钽为内标波长色散X射线荧光光谱法测定钨精矿中WO_3的新方法.以Na_2B_4O_7和Li_2B_4O_7(质量比65∶35)的混合物作为熔剂,Ta_2O_5为内标,同时加入LiNO_3为氧化剂,在1200℃下进行熔融制样,最后将本方法应用于实际样品的分析,结果表明,以钽作为内标测定WO_3,不仅可以在很大程度上降低实验操作和仪器测量带来的偏差,也可以消除基体效应的影响.方法用于测定白钨精矿和黑钨精矿中WO_3,其准确度和精密度优于重量分析法.
提齣瞭以鐽為內標波長色散X射線熒光光譜法測定鎢精礦中WO_3的新方法.以Na_2B_4O_7和Li_2B_4O_7(質量比65∶35)的混閤物作為鎔劑,Ta_2O_5為內標,同時加入LiNO_3為氧化劑,在1200℃下進行鎔融製樣,最後將本方法應用于實際樣品的分析,結果錶明,以鐽作為內標測定WO_3,不僅可以在很大程度上降低實驗操作和儀器測量帶來的偏差,也可以消除基體效應的影響.方法用于測定白鎢精礦和黑鎢精礦中WO_3,其準確度和精密度優于重量分析法.
제출료이단위내표파장색산X사선형광광보법측정오정광중WO_3적신방법.이Na_2B_4O_7화Li_2B_4O_7(질량비65∶35)적혼합물작위용제,Ta_2O_5위내표,동시가입LiNO_3위양화제,재1200℃하진행용융제양,최후장본방법응용우실제양품적분석,결과표명,이단작위내표측정WO_3,불부가이재흔대정도상강저실험조작화의기측량대래적편차,야가이소제기체효응적영향.방법용우측정백오정광화흑오정광중WO_3,기준학도화정밀도우우중량분석법.
A method has been developed for the X-ray fluorescence determination of WO_3 in tungsten concentrate. The samples are fused with mixture flux of sodium tetraborate and lithium tetraborate (65∶35) at 1200℃, and tantalum pentoxide was added as the internal standard. After cooling the cast bead, the W Lα and TaLα fluorescence emission intensity was determined by X-ray fluorescence spectrometry. The standard calibration beads were prepared with specpure tungsten trioxide. Tungsten contents of the samples are found by comparing the measured intensity ratio between sample beads and standard calibration beads. The experiment results show that with tantalum as the internal standard, not only the errors introduced by experimental operation and machine measurement can be depressed greatly, but also the matrix effect can be eliminated. The proposed method provides simple, rapid operation and high precision, and can be used for the determination of the tungsten content in both worfremite and scheelite accurately. The accuracy and precision of the method are found to be superior to those of the classical gravimetric method.