Performance of Avocado Seed Activated Carbon as Adsorbent for Highly Sensitive Determination of Cd Using a Flow Injection System Online Coupled to TS-FF-AAS

Abstract

A flow-injection preconcentration system using detection by the thermospray flame furnace atomic absorption spectrometry (FIA-TS-FF-AAS) is proposed. Cd 2+ are adsorbed on avocado seed activated carbon (ASAC) packed into a cylindrical mini-column and eluted using HCl solutions for the detection system. A 2 5 -1 fractional factorial and Doehlert matrix design were employed to determine the optimum conditions for cadmium preconcentration (pH 7.68, buffer concentration (Tris/Tris-HCl) of 0.023 mol L -1 , eluent concentration (HCl) of 2.0 mol L -1 , the adsorbent mass of 100.0 mg and preconcentration flow rate of 4.8 mL min -1 ). The preconcentration method presents linearity within the range of 0.41-15.00 µg L -1 , limits of quantification and detection of 0.41 and 0.12 µg L -1 , respectively, preconcentration factor of 10.7, consumption of index of 0.93 mL and sample throughput of 26 h -1 . The precision assessed as the relative standard deviation (RSD) were found to be 0.48, 0.90 and 2.30% for inter-day precision (n = 2), and 0.30, 0.44 and 2.48% for intra-day precision (n = 6) for respective cadmium concentration of 0.50, 5.00 and 15.00 µg L -1 . The proposed method was applied satisfactorily in samples of cigarette (62.84 ± 11.28 µg kg -1 ), human hair (69.61 ± 2.38 µg kg -1 ) and water samples [lake (0.65 ± 0.01 µg L -1 ), tap and mineral].

Avocado Peels and Seeds: Processing Strategies for the Development of Highly Antioxidant Bioplastic Films

“… 15 Other uses reported in the literature include the use of ASs to produce biodiesel 16 , 17 or for the production of carbonized materials used as absorbents. 18 However, there is no information in the literature on the application of avocado byproducts in the packaging field. Most of the publications that seek to value the industrial avocado waste (AW) are based on the use of the seeds, leaving aside the value that the peels can provide.…”

“…Besides, they are an important source of bioactive compounds with high antioxidant activity, which makes them highly attractive for the production of active food packaging . Other uses reported in the literature include the use of ASs to produce biodiesel , or for the production of carbonized materials used as absorbents . However, there is no information in the literature on the application of avocado byproducts in the packaging field.…”

Composite of methyl polysiloxane and avocado biochar as adsorbent for removal of ciprofloxacin from waters

“…The influence of the adsorbate solution's initial pH on the sorption capacity is one of the main variables that could affect the uptake of a molecule in an adsorbent (Kudo et al, 2020;Tomul et al, 2020).…”

“…The annual production of Avocado in Brazil surpasses 240,000 tons, which will generate about 60,000 tons of avocado seed (STATISTA, 2020). In addition, the preparation of activated biochar from avocado seed as an adsorbent has been reported in the literature (Leite et al, 2017(Leite et al, , 2018Kudo et al, 2020); however, this material presents the drawbacks of low mechanical strength.…”

Removal of a dye used in the textile industry using avocado seed Hass variety as a bio-adsorbent

“…Actualmente, el Perú es uno de los principales exportadores de palta a nivel mundial [8], [9], siendo Arequipa uno de los departamentos del Perú que se dedica al cultivo de palta. Los residuos de la palta corresponden a las cáscaras y a las pepas que son desechadas sin uso alguno, pese a que estudios han demostrado su potencial aplicación para remover contaminantes del medio ambiente como cromo, plomo [10], cadmio [11] y arsénico [12] de forma natural [10] o mediante modificaciones físicas como la elaboración de carbón activado [11], [13]- [15]. Por tal motivo, en la presente investigación tuvo como principal objetivo utilizar residuos de pepa de palta variedad Hass como potencial bio-adsorbente para remover el colorante Novacron Navy FNB de aguas contaminadas a escala de laboratorio, esto con la finalidad de promover más estudios sobre este biomaterial en relación a su capacidad en la remoción de contaminantes ambientales.…”