Question: (iii) You have measured the blank for a determination of arsenic in food samples by hydride generation atomic fluorescence spectrometry. The blank values are

(iii) You have measured the blank for a determination of arsenic in

(iii) You have measured the blank for a determination of arsenic in food samples by hydride generation atomic fluorescence spectrometry. The blank values are 0.23 ppb, 0.14ppb, 0.16ppb, 0.28ppb,0.18 ppb, 0.09 ppb, 0.10 ppb, 0.20 ppb As calculate. LOD at 95% and 99% confidence levels. [4 marks] (1) (II) Based on your answer in (iii) (I) Calculate the respective LOQ's for arsenic at the two levels. [1 mark]

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