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a. An analyst attempts to determine strontium with an atomic absorption spectroscopy (AAS) instrument equipped with a nitrous oxide-acetylene burner, but the sensitivity associated with the 460.7 nm atomic resonance line is not satisfactory. Suggest at least four things that might be tried to increase sensitivity. (4 marks) b. Inductive couple plasma - optical emission spectroscopy (ICP-OES) and Inductive couple plasma - mass spectrometry (ICP-MS) are preferred techniques for trace and ultra-trace metal estimations. You are requested to prepare a ICP equipment purchasing proposal to assist your company to decide between the two based on available budget and analysis requirements. Discuss the major element that differentiate these two instruments when considering the following equipment operational parameters: Concentration range Total dissolved solids content iii. Sample size iv. Isotopic analysis i. 11. UNIVERSITI TEKNOLOGI (2+2+273 STA c. Heavy metals with higher toxicity in water are arsenic (As) and lead (Pb). In order to ensure that the water quality at water reservoir is safe and can be used to supply water to residentials and factories, you were assigned to determine the As and Pb contents present in the water samples. The recommended water quality for arsenic and lead in raw water quality from the river is 0.01 ppm and 0.05 ppm, respectively. Propose on how you will deal with the matter by stating your procedure including: i. Sampling plan ii. Sample storage/preservation Sample preparation 111. LOGI MAR iv. Instrumentation used.