A Barragem Santa Bárbara localizada na cidade de Pelotas/RS possui quatro afluentes principais que por sua vez recebem despejos sanitários e industriais. A caracterização físico-química destas águas é importante para que o tratamento aplicado seja adequado e eficiente uma vez que são águas com fins de abastecimento público e que apresentam histórico de contaminação por excesso de manganês. Os objetivos deste trabalho foram caracterizar os principais afluentes da Barragem Santa Bárbara através de análises físico-químicas (pH, cloretos, oxigênio consumido, nitrogênio amoniacal, fósforo total, turbidez, demanda bioquímica de oxigênio e manganês total) e avaliar as correlações entre os parâmetros e o manganês. Para tal foram coletados dados físico – químicos nos registros do Serviço Autônomo de Saneamento de Pelotas (SANEP), referentes ao período de 2010 a 2015. Os parâmetros pH, cloretos, turbidez e oxigênio consumido estiveram de acordo com os padrões estabelecidos pela Resolução 357/05 do CONAMA; fósforo total, nitrogênio amoniacal, DBO5 e manganês total apresentaram resultados acima do permitido pela lei. O estudo das relações dos parâmetros físico-químicos com o Manganês mostrou haver correlações positivas e significativas entre Mn-Ptotal, no Epaminondas; Mn-Oconsumido no Epaminondas e na Sanga da Barbuda e Mn-Turbidez na Sanga da Barbuda, no Sítio Floresta e no Passo do Cunha.

This work describes the analysis of different chicken tissues (gizzard, heart, and liver) both raw and cooked with seasonings in different types of cooking pots (iron pot, , aluminum pot and hammered aluminum pot) commonly used in Brazil. The samples were decomposed using microwave-assisted digestion with diluted nitric acid; and the contents of Al, Ca, Cu, Fe, Mn and Ni were determined using Microwave Induced Plasma Optical Emission Spectrometry (MIP OES). The Fe content was also determined by Flame Atomic Absorption Spectrometry, and the comparison showed good accuracy of the method. The limits of quantification were below 0.011 mg kg-1, showing adequate detectability. Cooking in the different pots increased the ash and protein contents as well as decreased the moisture content. Box-plot and Principal Components Analysis showed that Ca and Fe contents present the largest variations in the samples, followed by Al and moisture. The variables Al, Cu, Mn, Ni, ash, and protein presented similar behavior after cooking in all different pots. In addition, liver cooked in both iron and hammered aluminum pots presented similar Fe contents, while gizzard and heart showed similar Ca contents.

This study evaluated the total concentrations of Cd, Cr, Cu, Pb and Zn in sediments samples from the São Gonçalo channel, Patos-Mirim lagoon complex, RS state, Southern Brazil during 2013 autumn, winter and spring, and 2014 summer. Ultrasound-assisted extraction method was employed to extract metals from the sediment samples. The sample powder was mixed with HNO3 and HF in an ultrasonic bath during 60 minutes at 25 oC. The limits of detection were 0.002; 0.026; 0.83; 0.386 and 0.44 mg kg-1 for Cd, Cr, Cu, Pb and Zn, respectively. The accuracy of the method was confirmed by analysis of two sediment certified reference materials and its precision was determined by the values of relative standard deviation lower than 9.1%. The concentrations obtained ranged from 0.11 to 0.58 mg kg-1 for Cd; 14.7 to 38.4 mg kg-1 for Cr; 3.9 to 102.0 mg kg-1 for Cu; 1.6 to 3.11 mg kg-1 for Pb; and 29.3 to 126 mg kg-1 for Zn. These values did not exceed the probable effect levels (PEL). Simplicity, low cost and high efficiency are some of the qualities of the method, making it adequate for routine analysis.

The concentrations of Ba, Ca, Cu, Fe, K, Na, Mg and Mn in different sugars, molasses and brown sugar candy were determined by MIP OES after acid decomposition.