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Indicators used in complexometric titration belong to ( )

A. adsorption indicator
B. acid-base indicator
C. proprietary indicators
D. metal indicators

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The detectors commonly used in atomic absorption spectrophotometers are:

A. Photocell
B. phototube
C. photomultiplier tube
D. photosensitive plate

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In the theory of atomic absorption analysis, one of the basic conditions for substituting peak absorption for integrated absorption is:

A. The half width of the emission line of the light source is much smaller than the half width of the absorption line
B. The half width of the emission line of the light source should be equivalent to the half width of the absorption line
C. The half width of the absorption line should be smaller than the half width of the emission line of the light source
D. The monochromator can distinguish the emission spectrum, which means that the monochromator must have a very high resolution

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In the complexometric titration with EDTA titrant, to determine the content of Al3+, an excessive amount of EDTA standard solution should be added first to produce Al3+-EDTA, and then the remaining EDTA standard solution should be titrated with Zn2+ standard solution. Finally, the content of Al3+ should be calculated from the consumed Zn2+ and EDTA. This method belongs to（）

A. indirect titration method
B. direct titration method
C. back titration
D. displacement titration

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In atomic absorption spectroscopy, if the components are complex and the content of the measured components is low, in order to analyze easily and accurately, which method is the best choice for analysis?

A. Working curve method
B. Internal standard method
C. Standard addition method
D. Indirect measurement method

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Indicators used in complexometric titration belong to ( )

A. adsorption indicator B. acid-base indicator C. proprietary indicators D. metal indicators

The detectors commonly used in atomic absorption spectrophotometers are:

In the theory of atomic absorption analysis, one of the basic conditions for substituting peak absorption for integrated absorption is:

In atomic absorption spectroscopy, if the components are complex and the content of the measured components is low, in order to analyze easily and accurately, which method is the best choice for analysis?

A. adsorption indicator
B. acid-base indicator
C. proprietary indicators
D. metal indicators