單項選擇題標準氫電極的相對平衡電位在什么溫度下為零()

A.常溫
B.任何溫度
C.零度以下
D.4℃


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1.單項選擇題電位分析法測量的電學(xué)參數(shù)是()

A.電流
B.電導(dǎo)
C.電量
D.電位

2.單項選擇題AFS和AAS在應(yīng)用中的主要不同之處是()

A.測定元素的種類
B.精密度
C.檢測限
D.多元素同時測定

3.單項選擇題下述哪種干擾在AFS中比在AAS中更嚴重()

A.散射干擾
B.背景干擾
C.物理干擾
D.化學(xué)干擾

5.單項選擇題下列哪種原子熒光是反Stokes熒光()

A.Cr吸收359.35nm,發(fā)射357.87nm
B.Pb吸收283.31nm,發(fā)射283.31nm
C.Pb吸收283.31nm,發(fā)射405.78nm
D.In吸收377.55nm,發(fā)射535.05nm

7.單項選擇題One of the main advantages of a graphite-furnace atomizer is that()

A.It requires only very small quantities of a sample
B.It requires metal.ions in aqueous solution
C.It does not produce background emission like a flame
D.It does not get hot like a flame

8.單項選擇題The purpose of the ashing step in graphite-furnace atomic-absorption spec-troscopy is to()

A.Vaporize metal atoms to be analyzed
B.Cause the metal species to form carbides which are more volatile
C.Convert the graphite furnace to ash to avoid carbide formation
D.Burn off organic species that would interfere with the elemental analysis

9.單項選擇題The purpose of the flame in flame atomic-absorption spectroscopy is to()

A.Purify the sample
B.Desolvate and atomize the analyte atoms in a sample
C.Excite the analyte atoms
D.Ionize the analyte atoms

10.單項選擇題A hollow-cathode lamp is()

A.A broad-band light source
B.A narrow-band light source
C.A light detector
D.Not a light source