1.) A consultant has to analyse nickel in soil samples. The instrument is an AAS which has a limit of detection of 0.1 mg/L. Take one 1.0 g and dissolve it in nitric acid (100 mL) and measure this by using an internal standard rhodium.

a. Give a sample preparation (work flow) in terms of traceability and work flow for the entire analytical process (ONLY bullet points)

b. Calculate the limit of detection in the soil.

c. Calculate the concentration of nickel in the soil when the original solution gives an absorbance of 0.5 mg/L if a blank gives zero and 2 mg/L gives 0.2, 4 mg/L gives 0.4 mg/L and 6 mg/L gives 0.6 Absorbance [AU] . [AU] is arbitrary units.

d. Give the corrected concentration of the internal standard rhodium was measured (sample 1.1 [AU] and standards 1.0 [AU]).