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1. When reporting the results of replicate analytical measurements three pieces

ID: 528940 • Letter: 1

Question

1. When reporting the results of replicate analytical measurements three pieces of information are required. Wh ONE of the following is NOT one of those? A. An indication of the precision of the data. B. The mean value. C. The type of measurement. D. Units of concentration. (1 mark) 2. Data sets often contain values which are clearly outliers when compared to the rest of the data set. Which ONE of the following is a statistical method of excluding such an outlier? A. T-test. B. F test. C. 1.96 x standard deviation rule. D. None of the above. (1 mark) 3. Which ONE of the following is NOT an atomic spectroscopy technique? A. Atomic absorption spectroscopy with flame atomisation. B. Plasma atomisation with optical emission spectroscopy. C. Atomic emission spectroscopy with flame atomisation. D. Fluorescence spectroscopy with UV atomisation. (1 mark) 4. Which ONE of the following descriptions with regards to the effect of temperature on the stability of the analytical signal in atomic spectroscopy is correct? A. Temperature does not have any effect on the analytical signal. B. Emission signals are more stable at high temperatures. C. Emission signals are more stable at low temperatures. D. Absorption signals are favoured at high temperatures. (1 mark) 5. Flame emission spectroscopy is best for analysing what types of samples? A. Relatively volatile elements such a sodium and potassium. B. Solid samples. C. Any metallic element. D. Lanthanide elements. (1 mark)

Explanation / Answer

1) b) the mean value

2) Grubbs T test detect one outlier at a time : G = Y- Ymin/ s      when minimum value is outlier

                                                                       G = Ymax -Y/ s       when maximum value is outlier

                                       Y = simple mean deviation     s = standered deviation   Ymin= minimun value Ymax= maximum value

3)(D) Flourescence spectroscopy with UV atomisation.

4) Higher temperature enhances emission intensties & provide greater sensitivity instead it is always desirable to carry out alkali metals analysis at low temperature to avoid interfence by other elements.

5)(A) Flame emission spectroscopy is used for analysia of Na & k.

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