Optimization of HS-SPME analytical conditions using factorial design for trihalomethanes determination in swimming pool water samples

The method was successfully applied to a set of 27 swimming pool water samples collected in the Oporto area (Portugal). TCM was the only THM detected with levels between 4.5 and 406.5 μg L− 1. Four of the samples exceeded the guideline value for total THMs in swimming pool water (100 μg L− 1) indicated by the Portuguese Health Authority.