Abstract
The applicabilities of gas chromatography (GC), high-performance liquid chromatography (HPLC), thin-layer chromatography (TLC) and high-performance thin-layer chromatography (HPTLC) for residue analysis of s-triazine herbicides are compared. With the conditions discussed the detection limit for the 14 s-triazines was determined as follows: 0.02–0.03 ng in GC alkali flame-ionization detection, 0.8 ng in GC flame-ionization detection, 1 ng in HPLC (UV detection), 3–5 ng in HPTLC (UV detection) and 8–13 ng in TLC (UV detection). The linear range in GC (AFID) was 10 4 whereas in the three liquid chromatographic methods it was 10 2. The reproducibility with a confidence limit of P = 95% has a coefficient of variation of ±5%. In routine analysis requiring a large number of separations HPTLC has advantages, because the time for a single separation is only 40 sec.
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