Evaluation of the Concentration of Cu, Zn, Pb and Cr in Different Fish Species from the São Gonçalo Channel in Pelotas-RS, Brazil

Abstract

The objective of this study was to evaluate the concentration of Cu, Zn, Cr and Pb in different species of fish collected in the estuarine and limnic regions of the São Gonçalo channel, located in the Patos-Mirim lagoon complex in the coastal plain of Rio Grande do Sul State (Southern Brazil) during 2013 (autumn, winter and spring) and 2014 (summer). Fish samples were decomposed in a digester block with a reflux system under conditions optimized using a central composite design as it follows: 250 mg of fish sample, 5 mL HNO 3 , 2 mL H 2 O 2 during 2 h at 150 °C. The concentrations obtained ranged from 6.7 to 12.0 mg kg-1 for Cu; 1.8 to 23.6 mg kg-1 for Zn; 37 to 487 µg kg-1 for Pb; and 40 to 1268 µg kg-1 for Cr. The highest concentrations of Cu, Zn and Pb, were observed in fishes collected at locations in the estuarine region and Cr showed high levels, especially in the limnic region. The samples of the species Loricariichthys anus (viola) showed the highest concentrations of all analytes investigated.

Development and Validation of a New Method for Determination of Pb and Cr in Marine Organisms by Total Reflection X-Ray Fluorescence (TXRF) Spectroscopy

“…In addition, a shorter reading time (300 s) was used by the proposed TXRF method. Besides, our LODs were improved in comparison with the detection limits obtained by the flame atomic absorption spectrometry (FAAS) [18] and energy-dispersive X-ray fluorescence (EDXRF) [13].…”

“…Furthermore, one of the most successful ways to obtain valuable information about the interaction of heavy metals with marine organisms is the determination of their concentrations in different seasons of the year, allowing the environmental biomonitoring. Thus, taking into account the above, different analytical techniques have been used with this purpose, such as inductively coupled plasma mass spectrometry (ICP-MS) [15], inductively coupled plasma atomic emission spectroscopy (ICP-AES) [16, 17], graphite furnace-atomic absorption spectrometry (GF-AAS) [18], square wave anodic voltammetry (SWASV) [19], electrothermal atomic absorption spectrometry (ETAAS) [20], hydride generation coupled to atomic absorption spectrometry (HG-AAS) [21], atomic fluorescence spectrometry coupled to the hydride generation (HG-AFS) [22], energy dispersive X-ray fluorescence (EDXRF) [13], and the total reflection X-ray fluorescence (TXRF) spectroscopy [23].…”

Determinação de metais em peixes e camarão-rosa (Farfantepenaeus paulensis) do estuário da Lagoa dos Patos (Pelotas-RS, Brasil) por MIP OES

“…O elemento Cu foi detectado nas amostras de bagre, pintado e corvina, com concentrações na faixa de 0,41 a 6,6 mg kg -1 . O valor máximo de Cu encontrado na amostra de pintado se aproximou ao encontrado por Alves et al (2018), em peixes da mesma espécie do Canal São Gonçalo, e por Olmedo et al (2013), em amostras obtidas no mercado público de Granada, Espanha, enquanto que o valor mínimo se aproximou ao encontrado por Grotto et al (2012). As concentrações de Cu obtidas ficaram todas abaixo do limite máximo permitido para pescados pela ANVISA (Brasil, 2005), de 30 mg kg -1 .…”

“…Para o preparo das amostras de peixes, utilizou-se o método que foi desenvolvido por Alves et al (2018). Foi pesado aproximadamente 0,25 g de amostras de filé de peixe diretamente nos tubos de digestão e, posteriormente, adicionaram-se 5,0 mL de HNO3 65,0% (v/v).…”

Recent Techniques in Nutrient Analysis for Food Composition Database

“…The matrix modification technique using chemical modifiers is a very important feature in the concept of trace metal determinations with very minimal interference. The chemical forms and therefore the physical properties of the element studied or the matrix can be changed by the addition of a suitable reagent (matrix modifier) in excess to the sample and standard reference solutions [ 36 , 65 , 66 , 67 , 68 ].…”