@article{articlea87ba31f, title = {Turbidimetric determination of sulfate in rainwater employing a LED based photometer and multicommuted flow analysis system with in-line preconcentration}, author = {Zárate, Néstor and Pérez-Olmos, Ricardo and Reis, Boaventura Freire dos}, year = {2011}, doi = {10.1590/s0103-50532011000600002}, journal = {Journal of the Brazilian Chemical Society} }