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The degradation of triazophos in aqueous solutions was monitored at 205 and 254 nm after separation using high-performance liquid chromatography. An ODS column was used with a mobile phase of 60% acetonitrile and 0.04% phosphoric acid at a flow rate of 1.4 cm³ min^-1. When dissolved in distilled water, ∼30% of the original triazophos was detected. The effect of heating time and temperature on a 0.5 mg dm^-3 standard was investigated. Over a 150 min period at 100 °C the peak area detected for the standard decreased by 58.67 ± 6.19 and 65.03 ± 4.61% when measured at 254 and 205 nm, respectively. The precision of the absorbance detected at 205 and 254 nm was 3.54 ± 2.8 and 3.86 ± 3.9%, respectively. There was a significant difference (P = 0.10) between the precision of the results obtained at each wavelength. The t_calcd value was −2.236 and the t_crit value was 1.94. The most sensitive …