The extraction of cadmium from aqueous solution using kerosene as a bulk liquid membrane (BLM) with Tri-n-butyl phosphate (TBP) as a carrier was experimentally investigated under various operating conditions. The effects of feed and strip pH, feed initial concentration, TBP concentration, and strip to feed volume ratio on the cadmium ions …
Os solos Glei Pouco Húmico e Vertissolo apresentaram valores de BMS-C similares aos do controle a partir de 24 horas de incubação; o solo Planossolo arenoso apresentou valores similares aos do controle com …
The geology of the mineralized areas in Zimbabwe, rich in chalcopyrite / pyrite, allows a number of microorganisms to be used for the extraction of minerals by …
Liquid-liquid extraction of copper(II), zinc(II), cadmium(II), and lead(II) from aqueous solution and sewage effluent using phenoxy-amino ligands George S. Nyamato, Kelvin Wambugu, John Kiratu, Stephen O. Ojwach; Affiliations George S. Nyamato Department of Physical Sciences, University of Embu, P.O Box 6-60100, Embu, Kenya ...
The PME value for zinc, lead, nickel, and cadmium, at the optimum condition, was 5.68%, 7.44%, 52.63%, and 8.82%, respectively. 4. Conclusions. In this study, S. europaea was used to phyto-extract zinc, lead, nickel, and cadmium from ZLR. Due to the high heavy metals toxicity and high salinity of ZLR, the experiments were performed at …
Abstract. Background: People living and working in ASGM areas are exposed to toxic metals such as arsenic (As), cadmium (Cd), mercury (Hg) and lead …
However, additional exposure to other toxic metals such as arsenic (As), cadmium (Cd) and lead (Pb) may result from mining-related activities and could be …
When heavy metals such as cadmium and lead are emitted into the soil, air and water, they pollute the environment. Use of polluted river water for irrigation, which …
This study focuses on the development and application of a novel nanocomposite (functionalized nanodiamonds@CuAl 2 O 4 @HKUST-1)-based µ-SPE method for the sensitive and selective extraction of Pb and Cd from food and water samples. The technique offers high sensitivity and selectivity, allowing accurate …
The implementation of the high-temperature alkaline extraction procedure resulted in the isolation of a new acid-soluble fraction (ASF), capable of binding cadmium at pH 4.5, which cannot be isolated by the standard neutral extraction protocol. Sargassum brown algal species have recently shown promise for use in flow-through column …
The cadmium extraction percentage, based on the contents of the sample digests, was within 91.2 +/- 10.1% to 109.7 +/- 10.1%. The cadmium detection limits were 3 and 8 ng g(-1) Cd, respectively ...
1. Introduction. Cadmium (Cd) in soils is of global concern because it is persistent and causes biomagnification and bioaccumulation, detrimental effects on the plant-soil ecosystem, and potential health risks (Li et al., 2020; Zeng et al., 2020; Zhao et al., 2015).Phytoremediation is a currently accepted green strategy that can be used to …
Previous studies have shown that cadmium (Cd) is an important micronutrient for phytoplankton in the ocean and that its content has great potential for tracing variations in marine primary productivity. However, there have been limited investigations into the accurate extraction of Cd from marine primary carbonates. In this …
Abstract An intensified oxidative acid leaching of copper–cadmium-bearing slag featuring using high-efficient oxygen carrier, such as activated carbon, was investigated to achieve high leaching rate of valuable metals. The effects of leaching variables, including agitation rate, sulfuric acid concentration, temperature, slag particle …
About 16 field trials testing N. caerulescens (Alpine pennycress, formerly Thlaspi caerulescens) cultivation for soil metal extraction were carried out in the last 25 years at several places in the world.The first trials of this type were conducted from the beginning of the 1990s in Great Britain, at Woburn (Fig. 1), under the supervision of the …
A significant amount of cadmium was extracted using Co-D2EHPA at equilibrium pH ∼ 3.5 and the McCabe-Thiele diagram showed that cadmium can be extracted through three stages using O/A ratio of 1. Stripping tests revealed that cadmium can be stripped from the loaded organic using 0.4 M H 2 SO 4 in a single …
A variety of reagents, including P204, P507, and Cyanex 301, were used for extraction of cobalt and cadmium from cobalt sulfate solution. It was found that Cyanex 301 exhibited the best separation efficiency for cadmium and cobalt from solution containing 90 g L−1 Co and 3 g L−1. The effects of initial pH, extractant concentration, …
For washing, the Cd removal efficiency was 66% for intact rice grain and almost for rice flour but only after washing for 20 h at pH 3.0; For HPE, a 600 MPa-10 min treatment at pH 5.5 yielded ...
They demonstrated the dependence of cadmium extraction on equilibrium pH of the aqueous phase and extractant concentration. The mechanism of metal transfer involves 1:3 metal to extractant complex formation. Addition of salts shows variable effect on percent extraction of Cd(II). Mixtures of extractants indicated TOPS99 as the best …
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1. Introduction. Cadmium and lead as serious pollutants threaten the environment. Various sources can bring these metals into the environment. The most important of these sources are industrial wastewater, burning of fossil fuels, and industrial activities such as casting and smelting (Montazer-Rahmati et al., 2011).More precisely, …
1. Introduction. Contamination of agricultural lands with cadmium (Cd) is a serious and widespread problem because Cd is both toxic and highly mobile (Bian et al., 2014; Hu et al., 2016; Tang et al., 2016b).Cadmium is classified as a Group-1 carcinogen by the National Toxicology Program (NTP, 2016), and long-term exposure to Cd …
The experimental data of cadmium extraction in pH range of 0.5–3, temperature of 25, 40 and 60 °C and various proportions of organic solvents (D2EHPA and Cyanex 302) were used to propose ...
The release of high levels of toxic metals, particularly arsenic (As), cadmium (Cd), and lead (Pb), that occur along with the gold-bearing ores due to the geological formation has been reported in ...
It was shown that the extraction of zinc and cadmium by DEHPA and/or MEHPA can be increased by an increase of pH. The results also illustrate that the pH 0.5 of zinc, by increase in MEHPA from 0.1 to 8 vol%, did not vary significantly while that of cadmium varies from 0.63 to 2.4. In other words MEHPA prevents selective extraction …
The optimum conditions for the maximum extraction of lead and cadmium ions were established with initial concentration of metal ion solutions: Pb 2+ (20.0 mg/L) and ... Biftu WK, Suneetha M, Ravindhranath K (2021b) De-fluoridation studies: using Lanthanum-alginate-beads impregnated with green synthesized nSiO2 and active …
Methods: We assessed levels of metal release from Richmond landfill in the city of Bulawayo, Zimbabwe by measuring lead, cadmium, chromium and copper levels …
The magnetite adsorbents then utilized the adsorbent in Cadmium ions removal of the aqueous solution. Fe 3 O 4 with 8 h milling time was able to remove 9.81 mg of cadmium ions with 1 g of ...
Use of the prepared HDES and the ultrasound-assisted extraction method proved to be an excellent option for the extraction of cadmium from different sewage …
Cadmium (Cd) in oceans has been extensively studied over the past few decades. Some studies have shown that the biogeochemical cycle of Cd in the ocean is similar to that of the macronutrient phosphate.1,2 Thus, Cd can serve as a micronutrient for phytoplankton.3,4 In recent years, an increasing number of
However, additional exposure to other toxic metals such as arsenic (As), cadmium (Cd) and lead (Pb) may result from mining-related activities and could be ingested via dust, …
PDF | On Jul 25, 2015, Fariborz Omidi and others published Solid phase extraction and trace monitoring of cadmium ions in environmental water and food samples based on modified magnetic nanoporous ...
The role of the crown ether is to solvate or complex the co-cation in the organic phase. Solvent extraction of cadmium from aqueous hydrochloric acid media (1–11 M) into dichloromethane solutions of 18-crown-6, dibenzo-18-crown-6 and dicyclohexyl-18-crown-6 (DC18C6) has been studied at 25 °C (Yaftian et al., 2005).
Experiments were conducted to study the hydrolytic stability of a 0.2 M Cyanex 923 toluene solution against 5 M HCl. The extraction of Cd (II) was periodically checked after 5 days using the above Cyanex 923 solution. No decrease in the percent of Cd (II) extraction (92–91%) is observed even after a contact of 50 days.
Cadmium (Cd) contamination of farmland soils is a growing concern because of its highly toxic impact on ecosystems and human health. Chelator-assisted washing and chemical immobilization are effective remediation strategies for Cd-contaminated soils. ... and liquid-to-soil ratio (L/S) on Cd extraction was studied and optimized to attain the ...
