Comparison of three methods for measuring heavy metals in calcareous soils of Iran

Shahbazi, Karim; Beheshti, Mehdi

doi:10.1007/s42452-019-1578-x

Cited by 26 publications

(10 citation statements)

References 46 publications

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“…10 The mixture of HCl and HNO3 in the ratio of 3:1 (aqua regia or King's water) for digestion is the standard method recommended in ISO 11466. 12,14 Aqua regia method has many benefits including its easier use and being economical. 12,14 Undoubtedly, this method has turned out to be effective and now widely used for soil related samples.…”

Section: Discussionmentioning

confidence: 99%

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Determination of Lead, Arsenic and Chromium Contents in Two Types of Mineral Trioxide Aggregate Using Atomic Absorption Spectrometry

Khan¹,

Khan²

2020

J Pak Dent Assoc

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OBJECTIVE: To evaluate the acid-soluble Arsenic, Lead, and Chromium contents in the two varieties of Mineral Trioxide Aggregate (MTA) using Atomic Absorption Spectrophotometry. METHODOLOGY: Analysis of Arsenic, Lead, and Chromium in the two products of MTS [MProRoot MTA and MTA Angelus] were done using graphite furnace atomic absorption spectrophotometry employing 2.4 mol/L of hydrochloric acid for digestion of materials. The test materials were subjected to incubate in water and simulated body fluid (SBF) so that the leach out metal ions from the material can also be quantified. Descriptive statistics reported along with ANOVA for comparison of quantitative analysis of Arsenic, Lead, and Chromium in the extracts of the two MTA products. One way ANOVA was applied to compare the leach out of metals over 15 days. Level of significance was kept at 0.05. RESULTS: Both varieties of MTA [ProRoot MTA and MTA Angelus] leached out extracts into water and SBF showing lower values of Arsenic and Lead contents in accordance to the limit set by ISO 9917-1 (2007). However, extracts of both the products had comparatively higher amount of Chromium ions. CONCLUSIONS: The total amount of Arsenic, Chromium, and Lead released from the two cements were found to be far below than what is considered as clinically harmful. KEYWORDS: Chromium; Arsenic; Lead, heavy metals; Mineral trioxide aggregate HOW TO CITE: Khan TN, Khan FR. Determination of lead, arsenic and chromium contents in two types of mineral trioxide aggregate using atomic absorption spectrometry. J Pak Dent Assoc 2020;29(4):223-227.

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Section: Discussionmentioning

confidence: 99%

“…12,14 Aqua regia method has many benefits including its easier use and being economical. 12,14 Undoubtedly, this method has turned out to be effective and now widely used for soil related samples. For dental materials, the specified digestion method is documented as standard ISO 9917; the same has been employed in the present study.…”

Section: Discussionmentioning

confidence: 99%

Determination of Lead, Arsenic and Chromium Contents in Two Types of Mineral Trioxide Aggregate Using Atomic Absorption Spectrometry

Khan¹,

Khan²

2020

J Pak Dent Assoc

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“…It is important to emphasize that both the limit of detection (LOD) and the limit of quantification (LOQ) of the aqua regia method were reported by Shahbazi and Beheshti (2019) to be very low: LOD = 7.11 mg/kg and a LOQ = 21.33 mg/kg. These values appeared to be even lower when we examined the boxplot (Figure 2) and the descriptive statistics (Table 1) of the Pb (mg/kg) values.…”

Section: Methodsmentioning

confidence: 99%

Spatial Distribution of Lead (Pb) in Soil: A Case Study in a Contaminated Area of the Czech Republic

Francos¹,

Gholizadeh²,

Dor³

2021

Preprint

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For decades, the Příbram district in the Czech Republic has been affected by industrial and mining activities. These activities are important sources of heavy metal pollutants that are detrimental to soil quality. A recent study examined visible–near-infrared (VNIR), shortwave-infrared (SWIR) and X-ray fluorescence (XRF) spectroscopy to model soil lead (Pb) content in a selected area located in the Příbram district. Following that study, and using the same chemical and geographical data, we examined the spatial distribution of Pb content in the soil, with a combination of different traditional spatial analyses (Moran’s I, hotspot analysis, and Kriging) that were significantly validated. One of the novel points of this work is the use of the Getis–Ord hotspot analysis before the execution of a Kriging interpolation model to better emphasize clustering patterns. The results indicated that Pb was a spatially dependent soil property and through extensive in situ sampling, it was possible to generate a very accurate Kriging interpolation model. The high-Pb hotspots coincided with topographic obstacles that were modeled using topographic profiles extracted from the open-source Google Earth platform, indicating that Pb content does not always exhibit a direct relationship with topographic height as a result of runoff, due to the contribution of topographic steps. This observation provides a new perspective on the relationship between Pb content and topographic patterns.

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“…The flasks were agitated in a shaking incubator (VS-8480 F) at 25 °C from 15 min to 5 h. The solution pH was controlled using 0.1 N HCl or 0.1 N NaOH and mixed with magnetic stirrer. After adsorption, the solution was filtered using MF membrane filters, Millipore 0.45 µm prior to heavy metal analysis by ICP, PerkinElmer Optima 2100DV (Shahbazi, 2019). The heavy metal adsorption capacity ( q e ) and removal rate % of carbonized water hyacinth stem were calculated in Eqs (2) and (3) respectively (Sabir, 2020).…”

Section: Methodsmentioning

confidence: 99%

Effect of carbonization on the surface and influence on heavy metal removal by water hyacinth stem-based carbon

Tinega

Warui

2021

MEQ

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PurposeThe aim of this study is to examine the effect of carbonization on the surface and its influence on heavy metal removal by water hyacinth based carbon.Design/methodology/approachDried water hyacinth stem was used as precursor to prepare carbon based adsorbent by pyrolysis method. The adsorbent proximate (ash, volatile matter and fixed carbon) and elemental (carbon hydrogen nitrogen sulfur) composition, surface area, pore size distribution, surface chemistry was examined and compared.FindingsThe results demonstrated that through carbonization in comparison to dried water hyacinth stem, it increased the surface area (from 58.46 to 328.9 m2/g), pore volume (from 0.01 to 0.07 cc/g), pore size (from 1.44 to 7.557 Å) thus enhancing heavy metal adsorption. The metal adsorption capacity of Cd, Pb and Zn was measured and analyzed through induced coupled plasma-mass spectrometer. At metal concentration of 0.1 mg/l adsorption rate for Cd, Pb and Zn was 99% due to increased large surface area, coupled with large pore size and volume. Furthermore, the adsorbent surface hydroxyl group (OH−) enhanced adsorption of positively charged metal ions through electrostatic forces.Practical implicationsIt is presumed that not only adsorption with synthetic wastewater but real wastewater samples should be examined to ascertain the viability of adsorbent for commercial application.Originality/valueThere are little or scanty data on the effects of carbonization on water hyacinth stem based carbon and subsequent effects on heavy metal removal in effluents.

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Comparison of three methods for measuring heavy metals in calcareous soils of Iran

Cited by 26 publications

References 46 publications

Determination of Lead, Arsenic and Chromium Contents in Two Types of Mineral Trioxide Aggregate Using Atomic Absorption Spectrometry

Determination of Lead, Arsenic and Chromium Contents in Two Types of Mineral Trioxide Aggregate Using Atomic Absorption Spectrometry

Spatial Distribution of Lead (Pb) in Soil: A Case Study in a Contaminated Area of the Czech Republic

Effect of carbonization on the surface and influence on heavy metal removal by water hyacinth stem-based carbon

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