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

Abstract

Um método eletroanalítico foi desenvolvido para determinação simultânea de íons cobre e chumbo em cachaça empregando eletrodo de pasta de carbono modificado com ácido ascórbico e nanotubos de carbono (CPE-AaCNT). A técnica de voltametria de onda quadrada (SWV) com redissolução anódica foi empregada e otimizada com relação aos seguintes parâmetros: frequência (50 Hz), amplitude (100 mV) e incremento de varredura (9 mV). As curvas analíticas apresentaram intervalo linear de 0,09 a 7,00 mg L -1 para o chumbo e para o cobre. Os limites de detecção foram de 48,5 e 23,9 µg L -1 para o chumbo e o cobre, respectivamente. O método desenvolvido foi aplicado na determinação simultânea de chumbo e cobre em cinco amostras comerciais de cachaça. Os resultados apresentaram-se concordantes com os obtidos por F AAS/GF AAS (espectrometria de absorção atômica com chama/espectrometria de absorção atômica com forno de grafite) e revelaram que CPE-AaCNT podem ser empregados com êxito na quantificação de cobre e chumbo em amostras comerciais de cachaça.The development of an electroanalytical method for simultaneous determination of copper and lead ions in sugar cane spirit (cachaça) using carbon paste electrode modified with ascorbic acid and carbon nanotubes (CPE-AaCNT) is described. Squarewave voltammetry (SWV) with anodic stripping was employed, and this technique was optimized with respect to the following parameters: frequency (50 Hz), amplitude (100 mV) and scan increment (9 mV). The analytical curves were linear in the range from 0.0900 to 7.00 mg L -1 for lead and copper. The limits of detection were 48.5 and 23.9 µg L -1 for lead and copper, respectively. The developed method was applied to the simultaneous determination of copper and lead in five commercial samples of sugar cane spirit. The results were in good agreement with those obtained by F AAS/GF AAS (flame atomic absorption spectrometry/graphite furnace atomic absorption spectrometry) and showed that CPE-AaCNT can be successfully employed in the simultaneous determination of these metals in real sugar cane spirit samples.

Selective and Effective Recovery of Copper From Printed Circuit Board Scraps

“…This voltammogram registered for the mixed 0.2 M copper and 0.03 M lead nitrate solution. In the investigated potential range, two oxidation reactions are occurred on anodic branch and respectively, two typical peaks are clearly revealed at -0.25 V and -0.47 V on cathodic branch, standing for reactions of lead and copper cations reduction: The similar voltammograms with redox reversible couple process for copper and lead are recorded in [13]. Theoretically, lead can also electrodeposited from strongly acidic solutions with a cathodic efficiency approaching 100 % as revealed on CV scans.…”

Development of cysteine-doped MnO2 quantum dots for spectrofluorimetric estimation of copper: applications in different matrices

“…The parameters of the presented study were compared to those of some previously reported methods [ 7 , 22 , 38 , 39 ]. The technique used, range of quantification, and LODs were compared (Table 4 ).…”

“…The technique used, range of quantification, and LODs were compared (Table 4 ). The proposed method overperforms those methods under comparison concerning applicability and sensitivity in terms of LOD and linearity range for quantification [ 7 , 22 , 38 , 39 ]. The proposed method was ultrasensitive with higher reliability than other reported methods with an LOD equal to 14.20 ng mL −1 .…”

“…The RSDs of the results (Table 4 ) refer to the better repeatability for applying the proposed method in quality control during food manufacture for improving food quality with a high sensitivity method. In addition, the proposed method is considered environmentally friendly compared to reported methods [ 8 ] which are based on using organic solvents and sophisticated instruments [ 7 , 22 , 38 , 39 ]. The presented work was established for a green, environmentally friendly, selective, and ultrasensitive method for the estimation of Cu using Cys@MnO 2 QDs.…”

Novel all-solid contact Copper (II) - selective sensor based on Cefoperazone and poly (3,4 -ethylenedioxythiophene) (PEDOT) as conducting polymer

“…Increasing this exposure beyond the 15 mg/day, copper becomes toxic [7]. Excessive intake of copper by humans can cause anemia, liver and kidney damage, and stomach and intestinal irritation [1] as well as diseases such as Wilson, Menkes, MS, Alzheimer, epilepsy, melanoma and rheumatoid arthritis [10]. Furthermore, copper can be phyto- 3,11,12].…”