Comparison of Analytical Techniques for Analysis of Arsenic Adsorbed on Carbon

2006 ◽  
Vol 41 (2) ◽  
pp. 185-189 ◽  
Author(s):  
Nirbhay Narayan Yadav ◽  
Saravanamuthu Maheswaran ◽  
Vaithiyalingam Shutthanandan ◽  
Suntharampillai Thevuthasan ◽  
Todd R. Hart ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Inductively Coupled Plasma ◽  
Ion Beam ◽  
Arsenic Concentration ◽  
Analytical Techniques ◽  
Optical Emission ◽  
Absorption Spectrometry ◽  
High Energy ◽  
Emission Spectrometry ◽  
Variable Surface

Abstract Activated carbon (AC) has been used extensively to treat arsenic-contaminated groundwater for a number of years. To date, attempts to quantify directly the amount of arsenic removed by the activated carbon using nondestructive methods has been limited. High-energy ion beam based proton induced x-ray emission (PIXE) is ideally suited to investigate the issues regarding the quantification of trace metals in solids. In this study, after the adsorption of arsenic on activated carbon, arsenic concentration in granular activated carbon (GAC) and powder activated carbon (PAC) were quantified using PIXE. The PIXE results were compared with atomic absorption spectrometry (AAS) and inductively coupled plasma optical emission spectrometry (ICP-OES) measurements. Some differences are observed between these measurements. The differences are greater in the case of GAC compared to PAC. These differences are mainly due to the inhomogeneous structure of GAC and PAC, which includes the variable surface properties such as surface area and pore sizes in each granule or particle. The larger differences are mainly due to the increased particle dimensions of GAC compared to PAC and the nature of the internal pore structure of GAC, which results in different amounts of arsenic adsorbed on different granules of GAC or even in different regions of one granule. This inhomogeneity of arsenic concentration is clearly visible in the arsenic concentration map generated for a single GAC particle using microbeam PIXE.

scholarly journals CO Adsorption Performance of CuCl/Activated Carbon by Simultaneous Reduction–Dispersion of Mixed Cu(II) Salts

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1605 ◽  
Author(s):  
Cailong Xue ◽  
Wenming Hao ◽  
Wenping Cheng ◽  
Jinghong Ma ◽  
Ruifeng Li
Keyword(s):  
Activated Carbon ◽  
Inductively Coupled Plasma ◽  
Co Adsorption ◽  
Optical Emission ◽  
Isosteric Heat ◽  
Cycle Performance ◽  
Emission Spectrometry ◽  
Separation And Purification ◽  
Monolayer Dispersion ◽  
Ideal Adsorbed Solution Theory

CO is a toxic gas discharged as a byproduct in tail gases from different industrial flue gases, which needs to be taken care of urgently. In this study, a CuCl/AC adsorbent was made by a facile route of physically mixing CuCl2 and Cu(HCOO)2 powder with activated carbon (AC), followed by heating at 533 K under vacuum. The samples were characterized by X-ray powder diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP-OES), N2 adsorption/desorption, and scanning electron microscopy (SEM). It was shown that Cu(II) can be completely reduced to Cu(I), and the monolayer dispersion threshold of CuCl on AC support is 4 mmol·g−1 AC. The adsorption isotherms of CO, CO2, CH4, and N2 on CuCl/AC adsorbents were measured by the volumetric method, and the CO/CO2, CO/CH4, and CO/N2 selectivities of the adsorbents were predicted using ideal adsorbed solution theory (IAST). The obtained adsorbent displayed a high CO adsorption capacity, high CO/N2, CO/CH4, and CO/CO2 selectivities, excellent ad/desorption cycle performance, rapid adsorption rate, and appropriate isosteric heat of adsorption, which made it a promising adsorbent for CO separation and purification.

scholarly journals DETERMINATION OF METAL CONTENT IN TEA LEAVES GROWN IN YEN BAI AND TUYEN QUANG PROVINCE, VIET NAM

2018 ◽  
Vol 55 (5A) ◽  
pp. 143
Author(s):  
Nguyen Thi Thao
Keyword(s):  
Heavy Metal ◽  
Inductively Coupled Plasma ◽  
Metal Content ◽  
Optical Emission ◽  
Absorption Spectrometry ◽  
Emission Spectrometry ◽  
Tea Leaves ◽  
Inductively Coupled ◽  
Metal Contents ◽  
Plasma Optical Emission Spectrometry

The metal contents of 19 tea leave samples, Camellia sinensis L., from Yen Bai and Tuyen Quang provinces were determined using inductively coupled plasma optical emission spectrometry (ICP-OES) and atomic absorption spectrometry (AAS). Total 18 elements in tea leaves were determined including macroelement such as Al, Ca, K, Mg, Mn; trace element such as Na, Ba, Fe, Cu, Sn, Zn, Se, Ni, B and heavy metal (Pb, Hg, Cd and metalloid As). The results show that, K content was the highest among the macroelement, followed by Mg, Ca, Mn and Al. There was a wide variation of the trace metal content among the tea leaves coming from different province. The levels of heavy metal content in most of the samples were not detectable or below the acceptable level as required by Ministry of Health.

Preparation and certification of human hair powder reference material.

1985 ◽  
Vol 31 (10) ◽  
pp. 1592-1597 ◽  
Author(s):  
K Okamoto ◽  
M Morita ◽  
H Quan ◽  
T Uehiro ◽  
K Fuwa
Keyword(s):  
Reference Material ◽  
Elemental Composition ◽  
Human Hair ◽  
Inductively Coupled Plasma ◽  
Analytical Techniques ◽  
Absorption Spectrometry ◽  
Emission Spectrometry ◽  
Detergent Solution ◽  
Plasma Atomic Emission Spectrometry ◽  
Ionic Detergent

Abstract Human hair powder reference material was prepared and certified for elemental composition. Human scalp hair (from Japanese men) was washed in a non-ionic detergent solution in an ultrasonic cleaner, dried, ground in an agate ball mill, sieved through a polyethylene net, blended, bottled (1100 vials, 2 g each), and finally sterilized by 60Co radiation. The prepared material satisfied the homogeneity criteria for a reference material. We determined trace elements by inductively coupled plasma atomic emission spectrometry and atomic absorption spectrometry and investigated matrix interference effects. The material was certified by using the data obtained by various analytical techniques; certified values are provided for Ca, Cd, Cr, Cu, Fe, Hg, K, Mg, Mn, Na, Ni, Sr, and Zn. The elemental composition of this reference material is considered similar to normal values for the male Japanese population.

scholarly journals An overview of methods used for quantification of heavy metal contents in vegetal samples

2021 ◽  
Vol 3 (2) ◽  
pp. 7-15
Author(s):  
Gina Vasile Scaeteanu ◽  
◽  
Rodica Maria Majdar ◽  
Andrei Mot ◽  
Keyword(s):  
Heavy Metals ◽  
Inductively Coupled Plasma ◽  
Anodic Stripping Voltammetry ◽  
Accurate Determination ◽  
Optical Emission ◽  
Stripping Voltammetry ◽  
Absorption Spectrometry ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry

Continuous monitoring of heavy metals content in vegetal products is a priority for food control and a risk assessment strategy for human health. Having in view the importance of heavy metals surveillance, the aim of this paper is to identify, on the basis of literature data, the most suitable procedures and techniques used for accurate determination of them in vegetal samples. In most cases, quantification of heavy metals in the vegetal matrix is preceded by digestion performed through different protocols chosen carefully because this is a critical step for obtaining accurate results. Among most used techniques for heavy metals’ assessment from vegetal products reported by literature it worth to be mentioned: atomic absorption spectrometry (AAS), inductively coupled plasma-mass spectrometry (ICP-MS), inductively coupled plasma - optical emission spectrometry (ICP-OES), X-ray fluorescence (XRF), neutron activation analysis (NAA), anodic stripping voltammetry (ASV).

scholarly journals Spectroscopic, Textural and Thermal Characterization Methods of Biostimulants Based on Sodium Humate

2019 ◽  
Vol 69 (12) ◽  
pp. 3477-3482
Author(s):  
Rusandica Stoica ◽  
Florin Oancea ◽  
Iulian Minca ◽  
Sanda Maria Doncea ◽  
Rodica Ganea ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Raw Materials ◽  
Nutrient Use Efficiency ◽  
Reference Method ◽  
Analytical Techniques ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Essential Information ◽  
Complex Investigation ◽  
Characterization Methods

Plant biostimulants, an emerging class of agricultural inputs, are complex products. The reproducibility of their specific action on plant metabolism and plant physiology, which lead to an enhanced nutrient use efficiency, stress tolerance and edible yield quality, is still a challenge. Development of quality insurance systems for plant biostimulants need complex investigation based on adapted analytical, physico-chemical and chemical methods. The objective of this work was to characterize commercial humate biostimulants through different analytical techniques (Fourier transform infrared spectroscopy - FTIR, thermogravimetric analysis- TGA) and to evaluate their textural and chemical (pH, C, N, humic acids, inorganic components) parameters. The first derivative curve from TG analysis showed decomposition of different compounds, classified according to the results obtained by FTIR. The humic substances determined by TGA method was comparable with the results obtained by gravimetric reference method. The inductively coupled plasma-optical emission spectrometry (ICP-OES) technique was applied to determine the inorganic elements either from the production process of humate or from raw materials, as well as for the control of humate in terms of requirements for safety and quality. Their complementary properties obtaining through different analytical techniques provide essential information on the chemical characteristics of the humate plant biostimulant formulations.

scholarly journals Determination of Metal Content in Valerian Root Phytopharmaceutical Derivatives by Atomic Spectrometry

2005 ◽  
Vol 88 (1) ◽  
pp. 221-225 ◽  
Author(s):  
Silvia Arce ◽  
Soledad Cerutti ◽  
Roberto Olsina ◽  
María R Gomez ◽  
Luis D Martínez
Keyword(s):  
Inductively Coupled Plasma ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Optical Emission ◽  
Absorption Spectrometry ◽  
Atomic Emission ◽  
Atomic Spectrometry ◽  
Emission Spectrometry ◽  
Ultrasonic Nebulization ◽  
Inductively Coupled ◽  
Plasma Optical Emission Spectrometry

Abstract Phytopharmaceuticals containing Valerian are used as mild sleep-inducing agents. The elemental composition of 3 different marks of Valeriana officinalis roots commercially available in the Argentinian market, their teas, and a commercial tincture have been studied. The content of Al, Ca, Cd, Co, Cr, Cu, Fe, Li, Mn, Ni, Pb, V, and Zn was determined in phytopharmaceuticals by flame atomic emission/absorption spectrometry, electrothermal atomic absorption spectrometry, and ultrasonic nebulization coupled to inductively coupled plasma-optical emission spectrometry. Prior to analyses of the samples, a digestion procedure was optimized. The analytical results obtained for Fe, Al, Ca, and V in the solid sample study were within the range 100–1000 mg/kg, and for Mn, Zn, and Pb within the range 10–100 mg/kg. Cadmium was found at levels up to 0.0125 mg/kg.

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