Discussion
Why must extraction time and temperature be reproduced exactly?
Answer: C
Only a fraction of the analyte transfers to the fibre, and that fraction depends on time, temperature, agitation and salt content, so every sample and standard must experience the same conditions. Coating degradation is gradual, decomposition is uncommon, and the injector desorbs whatever arrives. A method whose result depends on conditions rather than on completeness must control those conditions rigidly. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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