Method Development for Assessing Carbamazepine, Caffeine, and Atrazine in Water Sources from the Brazilian Federal District Using UPLC-QTOF/MS

Table 5

Percentage of recovery obtained for spiked extracts and for a Paranoá Lake sample spiked with all analytes.

Samples	Recovery (%)
	Caffeine	Carbamazepine	Atrazine
Extract spiked with 5.0 μg/L	83±11	79±9	107±6
Extract spiked with 95 μg/L	81±8	77±9	74±7
Extract spiked with 190 μg/L	80±8	62±8	64±6
Natural water spiked with 55 ng/L	102±6	78±5	112±7

Extracts of a Paranoá Lake sample (1 m) obtained after solid phase extraction. Filtered (0.45 um) Paranoá Lake sample.