Uncertainty evaluation for the determination of phenol in groundwater samples by 4-amino antipyrine chloroform extraction spectrophotometry

The measurement uncertainty of the analytical results of phenol in groundwater samples by 4-Amino antipyrine chloroform extraction spectrophotometry was evaluated using continuous propagation model of uncertainty. The standard uncertainty of a groundwater sample was evaluated and the expanded uncertainty was calculated, which shows the measurement is credible. The results show that the uncertainty caused by the curve fitting and the sample preparation makes a relatively great contribution to the expanded uncertainty.