Extensive exposure to and high toxicity of arsenic species have posed severe health threats worldwide. Consequently, it is imperative to develop novel dual functional materials, which can not only precisely monitor trace levels of arsenic, but also simultaneously realize its efficient decontamination. In this study, amino-functionalized iron-based metal organic framework (MOF) nanooctahedra have been successfully synthesized via a facile one-step solvothermal route for the selective detection and facile removal of arsenate from polluted water. Benefiting from the unique fluorescence enhancement and high specific surface area as well as excellent stability, the resultant NH2-MIL-88(Fe) nanooctahedra can be utilized for the quantitative assay of arsenate, accompanied by a fast response time (<1 min), broad linear range (0.1–50 μM) and high sensitivity (detection limit of as low as 4.2 ppb) along with excellent selectivity towards arsenate. More significantly, the proposed sensing system has been further exemplified for the determination of arsenate in real environmental water samples with acceptable recoveries, highlighting its feasibility in complicated environmental samples. It is noteworthy that the as-synthesized NH2-MIL-88(Fe) nanooctahedra also exhibit extraordinary sorption performance towards As(V) in terms of high saturated adsorption capacity (125 mg g−1) and fast sorption kinetics, capable of easily reducing trace amounts of As(V) to below the acceptable standard for drinking water within 60 min. These results indicate that the obtained NH2-MIL-88(Fe) nanooctahedra can be expected to be an excellent candidate for arsenic determination and remediation from contaminated water systems.

Bifunctional NH2-MIL-88(Fe) metal–organic framework nanooctahedra for highly sensitive detection and efficient removal of arsenate in aqueous media

Nanomaterial-based electrochemical biosensors for food safety

Electrochemical determination of copper ions in spirit drinks using carbon paste electrode modified with biochar

Anodic stripping voltammetry (ASV) using noble electrodes is based on the reduction of As3+ to As0, followed by its stripping or oxidation to As3+ or As5+ species, the two predominant forms of arsenic in water. The rapid and convenient ASV method can detect As(III) at the low ppb level, but it is susceptible to interferences from various endogenous metals or organic compounds in waters. Electrode surface modification with metallic nanoparticles (NPs), carbonaceous nanomaterials (carbon nanotubes and graphene) and even enzymes (arsenite oxidase) can improve detection sensitivity and selectivity, while circumventing such interferences. All electrochemical methods aim for a detection limit below the World Health Organization guideline value of 10 ppb (133.3 nM). Despite numerous publications in this field during the last ten years with respect to novel electrode materials and electrolytes, reproducibility of electrochemical detection is still problematic and the analysis of arsenic in real ground-water samples is far from certainty and triviality. Considerable efforts are still needed to develop electrode materials and analytical procedures for reliable detection of arsenic with sub-ppb levels in the presence of endogenous toxic metals and organics in water matrices.

Recent advances in electrochemical detection of arsenic in drinking and ground waters

Electrochemical determination of arsenic in natural waters using carbon fiber ultra-microelectrodes modified with gold nanoparticles.

Cathodic stripping voltammetric determination of arsenic in sugarcane brandy at a modified carbon nanotube paste electrode

Um metodo eletroanalitico foi desenvolvido para determinacao simultânea de ions cobre e chumbo em cachaca empregando eletrodo de pasta de carbono modificado com acido ascorbico e nanotubos de carbono (CPE-AaCNT). A tecnica de voltametria de onda quadrada (SWV) com redissolucao anodica foi empregada e otimizada com relacao aos seguintes parâmetros: frequencia (50 Hz), amplitude (100 mV) e incremento de varredura (9 mV). As curvas analiticas apresentaram intervalo linear de 0,09 a 7,00 mg L - 1 para o chumbo e para o cobre. Os limites de deteccao foram de 48,5 e 23,9 µg L - 1 para o chumbo e o cobre, respectivamente. O metodo desenvolvido foi aplicado na determinacao simultânea de chumbo e cobre em cinco amostras comerciais de cachaca. Os resultados apresentaram-se concordantes com os obtidos por F AAS/GF AAS (espectrometria de absorcao atomica com chama/espectrometria de absorcao atomica com forno de grafite) e revelaram que CPE-AaCNT podem ser empregados com exito na quantificacao de cobre e chumbo em amostras comerciais de cachaca.

/pdf/an-alternative-method-for-the-simultaneous-determination-of-4xh72ajujl.pdf

An alternative method for the simultaneous determination of copper and lead for quality control of sugar cane spirit using a nanotube-based sensor

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Cathodic stripping voltammetric determination of arsenic in sugarcane brandy at a modified carbon nanotube paste electrode

An alternative method for the simultaneous determination of copper and lead for quality control of sugar cane spirit using a nanotube-based sensor