scholarly journals Use of The Eggshells in Removing Heavy Metals from Waste Water - The Process Kinetics and Efficiency

2019 ◽  
Vol 26 (1) ◽  
pp. 165-174 ◽  
Author(s):  
Joanna Makuchowska-Fryc
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Flue Gas ◽  
Waste Product ◽  
Atomic Absorption Spectrophotometry ◽  
Main Element ◽  
Flame Atomic Absorption Spectrophotometry ◽  
Heavy Metal Cations ◽  
Flame Atomic Absorption ◽  
Kinetics Of

Abstract Studies of the efficiency of Ni, Cu and Cd cations removal from water solutions were carried out, with the use of clay limestone, hen eggshells from eggs for consumption and hen eggshells after hatching, which main element is calcium carbonate. Hen eggshells are a waste product, which can be used as a substitute of clay limestone in removing heavy metals from wet flue gas desulphurisation installation. Mixed solutions of Ni, Cu and Cd were used in the research, with the composition similar to the waste water from wet flue gas desulphurisation installation: Ni (0.009-0.053 mmol/dm3), Cu (0.008-0.057 mmol/dm3) and Cd (0.003-0.008 mmol/dm3). The metals were determined by flame atomic absorption spectrophotometry (F-AAS). Kinetics of the process was analysed and equilibrium parameters were estimated, taking into consideration changes of the solutions pH during the process duration. It was demonstrated that the dominating mechanism of cations removal is their binding in hydroxides and carbonates. The studies demonstrated comparable characteristics of hen eggshells versus clay limestone, in the context of their application in removal of heavy metal cations from solutions.

scholarly journals Quality of Commercial Coffees: Heavy Metal and Ash Contents

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Mariana Teixeira Pigozzi ◽  
Flávia Regina Passos ◽  
Fabrícia Queiroz Mendes
Keyword(s):  
Heavy Metals ◽  
Atomic Absorption Spectrophotometry ◽  
Ash Content ◽  
Flame Atomic Absorption Spectrophotometry ◽  
Absorption Spectrophotometry ◽  
Flame Atomic Absorption ◽  
Brazilian Legislation ◽  
Cadmium Lead ◽  
Ground Coffee

This study aimed to quantify the ash content and to determine the concentration of heavy metals in roasted ground coffee and their respective infusions. The ash content was determined by incineration of the samples, and the quantification of heavy metals was performed by flame atomic absorption spectrophotometry for the following metals: cadmium, lead, copper, chromium, nickel, and zinc. According to the ash analysis, 15% of the roasted ground coffee samples were within the standards established by the legislation of the state of São Paulo, which has set an ash content of below 5%. In the roasted ground coffee samples, the Cd, Cu, Ni, and Zn contents did not exceed the limit established by Brazilian legislation. In several samples, both Pb and Cr were found in high levels, exceeding the limits established by Brazilian legislation. In the infusions of roasted ground coffee, the Cd, Cu, Cr, and Ni contents were below the detection limit of the equipment. Zn was found in all infusions and Pb was only detected in seven coffee infusion samples. Overall, the concentrations of heavy metals found in the commercially roasted ground coffee and their respective infusions are lower than the limits recommended by the official inspection agencies and, thus, are suitable for consumption.

scholarly journals Chemometric Analysis of Grapes

2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Sasa S. Ranđelovic ◽  
Danijela A. Kostic ◽  
Biljana B. Arsic ◽  
Snezana S. Mitic ◽  
Ivana D. Rasic ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Atomic Absorption ◽  
Soil Water ◽  
Atomic Absorption Spectrophotometry ◽  
Chemometric Analysis ◽  
Flame Atomic Absorption Spectrophotometry ◽  
The Road ◽  
Absorption Spectrophotometry ◽  
Flame Atomic Absorption

AbstractConcentrations of several heavy metals in soil, water and grape samples (variety Plovdina) collected at five locations at different distances from the road in Southeast Serbia were determined using the Flame Atomic Absorption Spectrophotometry. There was a decrease in analyzed samples with an increase in distance from the road. A complete absence of several examined, very harmful heavy metals (Mn, Ni, and Cd) in all analyzed samples was found. The analysis of grape samples proved the presence of iron, zinc and copper in concentration ranges 3.3-19.8, 0.31-0.63, and 3.4-13.6 μg g

Reliable determination of copper complex ions in synthetic wastewater using flame atomic absorption spectrophotometry

2019 ◽  
Vol 79 (5) ◽  
pp. 833-841 ◽  
Author(s):  
Kanokporn Supong ◽  
Parnuwat Usapein
Keyword(s):  
Atomic Absorption ◽  
Copper Complexes ◽  
Atomic Absorption Spectrophotometry ◽  
Synthetic Wastewater ◽  
Flame Atomic Absorption Spectrophotometry ◽  
Working Standard ◽  
Absorption Spectrophotometry ◽  
Flame Atomic Absorption ◽  
Relative Standard ◽  
Delay Times

Abstract Forms of copper that are highly soluble in aquatic environments are used as chemical reagents in a variety of industries, especially copper complexes. Wastewater containing copper complexes can be difficult to treat and analyse. Normally, flame atomic absorption spectrophotometry (FAAS) is a favourable technique for analysing metal ions in wastewater, but is less reliable for copper analysis owing to the influence of copper oxides. To solve this problem, it is necessary to adjust the atomization and delay times. The objective of this study was to use FAAS to accurately determine the quantity of complexed copper in synthetic wastewater, using increased atomization and delay times. The method showed excellent linearity in the copper standard concentration range of 1–5 mg L−1. The sensitivity of the analysis was 0.023 mg L−1. The percentage of recovery and the relative standard deviation were 85.02% and 0.75%, respectively. The experimental results demonstrated that the estimation of uncertainty from preparation of working standard, repeatability uncertainty, instrument deviation, calibration curve and recovery uncertainty were 8.2 × 10−4, 4.49 × 10−4, 7.21 × 10−4, 21.25 × 10−4, and 98.19 × 10−4, respectively. Overall, the results showed the suitability of the FAAS method for determining copper in synthetic wastewater.

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