Answer / vishal shah

In GC analysis due sample preparation error, if your sample
is open in air so your result may down from initial
analysis,another is during sample preparation if your
tablet crush in morning and you take weight in afternoon
may result is down, Preparation-1: during sample
preparation first you weight crushed tablent in head space
vial than add diluent after all weight(if Time gape between
wieght and adding diluent).
Preparion :-2 During sample preparation first you add
diluent and than add sample may you resule higher than
prepartion :-1

Answer / suhas

Different detector givs different reponse for same sample,
i.e. HPLC have UV or RI and GC have FID or TCD.

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