FI on-line chemiluminescence reaction for determination of XXXX in water samples.

@entity1 @entity9588 @entity14457 @entity1068
This paper reports an economic, simple, and rapid FI-CL method for the determination of @entity14457 . This method requires simple instrumentation and it is fast enough to be used in routine analyses. A chemiluminescence signal is generated by reaction between photodegraded @entity14457 and @entity9588 solution in alkaline medium. All physical and chemical parameters in the flow injection chemiluminescence system were optimized in the experimental setting. To eliminate interference, a solid-phase extraction stage with SDB-1 cartridges and @entity1068 elution is applied. The signal- @entity14457 concentration relation is linear in concentration intervals between 0.0015 and 0.6  g  mL(-1). The calibration lines are statistically similar in different working conditions: standards with @entity1068 without extraction and standards with @entity1068 and extraction, allowing standards to be excluded from the extraction step, which simplifies the process. The detection limit (DL) is 0.5 ng  mL(-1), which is the same order as the maximum limit established in legislation regarding pesticide limits in water destined for @entity1 consumption. A DL of 0.13 ng  mL(-1) can be reached if a sample of 100 mL is preconcentrated. The interday variance coefficient is 3% and the sample throughput is 90 h(-1). The water analysis method is efficient with relative error percentages lower than 5% with respect to the added concentration.
