Ng. Gutierrez et al., DETERMINATION OF ZINC BY FLOW-INJECTION WITH FLUOROMETRIC DETECTION IN A MICELLAR MEDIUM, Fresenius' journal of analytical chemistry, 355(1), 1996, pp. 88-91
A room-temperature flow injection spectrofluorimetric method is presen
ted for the determination of Zn(II), based on the use of salicylaldehy
de thiocarbohydrazone in the presence of Triton X-100 and sodium aceta
te-acetic acid buffer. Various physical and chemical variables affecti
ng the reaction in the flow system were evaluated. The proposed method
is very selective. The calibration graph is linear over the range 10-
1000 ng/ml, with a detection limit of 5 ng/ml and a relative standard
deviation at the 50 ng/ml level of 1.8 %. The method was successfully
applied to the determination of Zn(II) in drinking waters and biologic
al samples.