x射線熒光光譜分析儀-文庫吧資料
2025-05-20 13:37本頁面
【正文】 ensitivity to trace elements than using nonmonochromatic Xrays. Since then, monochromatic Xrays have been often used for trace elemental analysis in the TXRF analysis. Detection limits down to femtograms (10?15 g) are obtained by using a monochromatic synchrotron radiation. On the other hand, we have developed a portable TXRF spectrometer using continuum Xrays from a 1WXray tube, and a detection limit of 1 ng for Cr was achieved. Trace elements in leaching test solutions of soils and drinking water were detected by using the portable spectrometer. The Xrays with continuous energy distribution are used as the excitation source, and the reflectivity of the incident Xrays on a sample holder at a glancing angle varies according to the Xray energies. Therefore, the signal to background ratios of each fluorescent Xray peak are different at each glancing angle. In the present paper, a specimen containing nanograms of Ca and 3d transition metal elements is measured at several glancing angles, and an optimum glancing angle for simultaneous trace elemental analysis is experimentally determined. A specimen containing nanograms of elements was measured at several glancing angles by using a portable TXRF spectrometer with a 1 W Xray tube, and an optimum glancing angle for detecting the elements in the specimen was experimentally determined. Although continuum Xrays were used, the intensities of the spectral background were low enough to detect these trace elements at a glancing angle that was smaller than the critical angle of 176。也可用于金屬材料、高純金屬、化工產(chǎn)品、化學(xué)試劑、巖石、礦物、土壤、植物等樣品中常量和痕量的定量分析。 生產(chǎn)廠家： 美國熱電集團(tuán)瑞士 ARL公司； 儀器型號 ： ADVANTXP； 主要附件 ： CWYII10kVA穩(wěn)壓電源 、循環(huán)水冷卻機(jī) 、 YYJ40壓片機(jī) 、 ZM1振動研磨機(jī) 、 CLAISSE熔樣機(jī)；聯(lián)想計(jì)算機(jī)； HP1200激光打印機(jī)； 儀器金額 ： ￥ 1736475； 主要用途及使用方向 ：配備 Uniquant 。 X熒光分析的 “ 標(biāo)樣 ” 不宜太少 ， 一般 “ 標(biāo)樣 ” 數(shù)要比分析元素的數(shù)目至少多兩個 ， 當(dāng)然 ， 越多越好 。 在參考樣品的制作過程中 ， 分析結(jié)果的重復(fù)性和樣品化學(xué)性質(zhì)的穩(wěn)定性是最主要的 。但是這些方法都要使標(biāo)準(zhǔn)樣品的組成與試樣的組成盡可能相同或相似 ， 否則試樣的基體效應(yīng)或共存元素的影響 ，
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