The behaviour of copper(II)-selective electrodes in chloride-containing solutions

Lanza, Pietro

doi:10.1016/s0003-2670(01)83736-3

Cited by 20 publications

(4 citation statements)

References 12 publications

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“…Interestingly, in some mineral media—Osterhout’s medium, AFW1, HMM, 0.9% and 2% NaCl—the LOD of Cu-ISE was lower than that in DI water (considered to contain 100% free Cu ions) ( Figure 1 , Table 2 ). As discussed by Lanza [ 34 ], this may be due to the presence of interfering ions like Cl − in these media. Indeed, the difference in electrode potential leading to abnormally low LOD values was observed only at low Cu concentrations; at higher Cu concentrations the difference between the electrode potential in DI water and these media disappeared ( Figure 1(a) ).…”

Section: Resultsmentioning

confidence: 99%

The Effect of Composition of Different Ecotoxicological Test Media on Free and Bioavailable Copper from CuSO4 and CuO Nanoparticles: Comparative Evidence from a Cu-Selective Electrode and a Cu-Biosensor

Käkinen

Bondarenko

Ivask

et al. 2011

Sensors

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The analysis of (bio)available copper in complex environmental settings, including biological test media, is a challenging task. In this study, we demonstrated the potential of a recombinant Pseudomonas fluorescens-based biosensor for bioavailability analysis of CuSO4 and CuO nanoparticles (nano-CuO) in seventeen different ecotoxicological and microbiologial test media. In parallel, free Cu in these test media was analysed using Cu-ion selective electrode (Cu-ISE). In the case of CuSO4, both free and bioavailable Cu decreased greatly with increasing concentration of organics and phosphates in the tested media. A good correlation between free and bioavailable Cu was observed (r = 0.854, p < 0.01) indicating that the free Cu content in biological test media may be a reasonably good predictor for the toxicity of CuSO4. As a proof, it was demonstrated that when eleven EC50 values for CuSO4 from different organisms in different test media were normalized for the free Cu in these media, the difference in these EC50 values was decreased from 4 to 1.8 orders of magnitude. Thus, toxicity of CuSO4 to these organisms was attributed to the properties of the test media rather than to inherent differences in sensitivity between the test organisms. Differently from CuSO4, the amount of free and bioavailable Cu in nano-CuO spiked media was not significantly correlated with the concentration of organics in the test media. Thus, the speciation of nano-CuO in toxicological test systems was not only determined by the complexation of Cu ions but also by differential dissolution of nano-CuO in different test conditions leading to a new speciation equilibrium. In addition, a substantial fraction of nano-CuO that was not detectable by Cu-ISE (i.e., not present as free Cu-ions) was bioavailable to Cu-biosensor bacteria. Thus, in environmental hazard analysis of (nano) particulate materials, biosensor analysis may be more informative than other analytical techniques. Our results demonstrate that bacterial Cu-biosensors either in combination with other analytical/speciation techniques or on their own, may serve as a rapid (eco)toxicological screening method.

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Section: Resultsmentioning

confidence: 99%

The Effect of Composition of Different Ecotoxicological Test Media on Free and Bioavailable Copper from CuSO4 and CuO Nanoparticles: Comparative Evidence from a Cu-Selective Electrode and a Cu-Biosensor

Käkinen

Bondarenko

Ivask

et al. 2011

Sensors

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“…To achieve this high sodium chloride concentration while maintaining a constant [Na+], the sodium nitrate concentration was correspondingly decreased. Values of Cu2+ were measured experimentally only by the IEX method since it is well-known that the ISE behaves anomalously in chloride media (27)(28)(29). The good agreement between the predicted solid line and the measured points must be considered somewhat fortuitous in light of the large standard deviation for the line (±5% Cu2+).…”

Section: Theorymentioning

confidence: 99%

Specificity of the ion exchange/atomic absorption method for free copper(II) species determination in natural waters

Sweileh¹,

Lucyk²,

Kratochvil³

et al. 1987

Anal. Chem.

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“…Auger spectroscopy has been employed by Moody et al (457) to examine and explain the response of copper(II) ionselective electrodes to chloride activity instead of copper(II) ion activity after being exposed to chloride ion. This behavior has also been discussed by Lanza (377) and a theoretical explanation has been given for this response by Wes tall, Morel, and Hume (697). Additionally, Pungor et al (537) have used electron microprobe analysis and photoelectron microscopy to study the surface morphology' of copper(II) ISEs and Bixler, Nee, and Perone (46) have studied anomolous behavior of chloride ISEs in the presence of Fe(III) in chloride solutions.…”

Section: Primary Electrodes (Fixed-site Electrodes)mentioning

confidence: 83%

Ion-selective electrodes

Fricke¹

1980

Anal. Chem.

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The behaviour of copper(II)-selective electrodes in chloride-containing solutions

Cited by 20 publications

References 12 publications

The Effect of Composition of Different Ecotoxicological Test Media on Free and Bioavailable Copper from CuSO4 and CuO Nanoparticles: Comparative Evidence from a Cu-Selective Electrode and a Cu-Biosensor

The Effect of Composition of Different Ecotoxicological Test Media on Free and Bioavailable Copper from CuSO4 and CuO Nanoparticles: Comparative Evidence from a Cu-Selective Electrode and a Cu-Biosensor

Specificity of the ion exchange/atomic absorption method for free copper(II) species determination in natural waters

Ion-selective electrodes

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