Vanadium, rubidium and potassium in <i>Octopus vulgaris</i> (Mollusca: Cephalopoda)

Abstract

SUMMARY: The levels of vanadium, rubidium and potassium were determined in Octopus vulgaris caught during commercial fishing activities at three locations (Cascais, Santa Luzia and Viana do Castelo) in Portugal in autumn and spring. We determined the concentration of these elements in digestive gland, branchial heart, gills, mantle and arms in males and females. At least five males and five females were assessed for each season/location combination. Elemental concentrations were determined by Particle Induced X-ray Emission (PIXE). Vanadium was detectable only in digestive gland and branchial heart samples. Its concentration was not correlated with total weight, total length or mantle length. There were no differences in concentrations of V, Rb and K between sexes. There were significant differences in vanadium concentrations in branchial hearts in autumn between samples from Viana do Castelo and those from the other two sites. We found a significant positive relationship between the concentration of vanadium and those of potassium and rubidium in branchial hearts. Branchial hearts appear to play an important role in decontamination of V.

Chemical characterisation of Nephrops norvegicus from Portuguese coast

“…Agusa et al ,49 on the other hand, reported higher Rb than Sr levels in some fish species from several locations in Cambodia, Indonesia and Thailand. In a study by Seixas and Pierce,50 Octopus vulgaris showed Rb levels between 3 and 5 mg kg −1 dry weight, somewhat higher than those found in N. norvegicus . Species of Lamellibranchiata and Gastropoda showed similar levels of Sr to those observed in N. norvegicus in the present study 37.…”

Trace Elements in Water, Sediments and the Elongate Tigerfish Hydrocynus forskahlii (Cuvier 1819) from Lake Turkana, Kenya Including a Comprehensive Health Risk Analysis

“…The study of Otachi et al (2014) reports 18.2 mg/kg Rb in muscle from O. leucostictus from Lake Naivasha. Although there is no agreement on the importance of Rb as an ultra-trace essential element to humans and other biota, some studies have shown that even low concentrations in combination with other metals such as Pb and Mo, can be toxic to fish and other organisms (Seixas and Pierce 2005;Yamaguchi et al 2007). Safe concentrations are not known and the RfDo is not given, therefore THQ was not determined for Rb.…”

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