SECTION A (2 short answer questions. Each question is worth Smarks) (Answer all questions) 1 Define the terms TIC and SI
Posted: Wed Jul 06, 2022 11:02 am
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2 9 low levels of a specific pesticide Tic and SC way SC be useful when trying to ca (5) The following low resolution mass spectra was obtained try analysing sample an unknow compound Add the missing anis tabers te & b) and identify the fragments c), d). Use this information to help identify what the chemical formula of this compound is? 151 Chemical formula: 15 B 44 a al 100
SECTION (2 Long answer multipart questions. Each question is worth 10 marks) [Answer all questions) 3. Analysis by HPLC ESHTORMS a) HPCC is well suited to analysing mistures of non volatile chemicals Describe how the instrument works giving specific details on the chromatography achieves separation of analytes of [21 b) ESI is commonly paired with HPLC, describe how this ionisation source works 14)
c) HRTOFMS has the potential to determine low levels of pollutants in full scan mode. Describe how this mass analyser works. (4)
4. Interpreting mass spectra a) The molecular formula for PCB 180 is Cu Discuss how the presence of chlorine atoms makes the isotopic pattern of molecular ions very distinctive in low resolution mass spectrometry. Then ustrate your answer by calculating the major isotopic patters (due to halides only for the molecular lon of PCB 180 CuHâ‚‚Cl 151 b) Identify ALL species which could contribute towards the M, (M+1), and (M+2) and peaks for the parent ion of hexanoic acid (CH(CH).COOH). (in a low resolution. mass spectrometer). [5]