scholarly journals Are Zirconia Bioceramics and Ceramics Intended to Come in Contact with Skin Inert?

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1697
Author(s):  
Lucien Reclaru ◽  
Lavinia Cosmina Ardelean ◽  
Catalin Adrian Miu ◽  
Alexandru Florian Grecu
Keyword(s):  
Inductively Coupled Plasma ◽  
Chemical Elements ◽  
Optical Emission ◽  
Ceramic Materials ◽  
Chemical Degradation ◽  
Emission Spectrometry ◽  
Zirconia Ceramics ◽  
Inductively Coupled ◽  
Monoclinic Form ◽  
To Come

Generally speaking, ceramic materials are insensitive to corrosion, compared to most other materials. The present study questions the fact that ceramics are inert. Two major aspects are to be considered: the stability of zirconia over time, the stable tetragonal phase transforming into an unstable monoclinic form; the multitude of manufacturing methods, using various additives, sintering additives, oxides mixing, impurities, grain boundaries, and porosities which strongly influence the corrosion behavior and chemical degradation. In case of the investigated ceramics two paths were pursued:a) Dissolutions of ceramics in a mixture of HNO3 60% and HF 40% ultrapure medium.b) Release of cations from ceramics in various mediums:dental bioceramics in a 0.07 M HCl medium and a 0.1% NaF+0.1% KF medium; ceramics used in jewelry and watchmaking applications in a HCl 0.07 M medium and an artificial sweat medium. By inductively coupled plasma-optical emission spectrometry/mass spectrometry (ICP-OES/MS), traces of significant chemical elements were assessed: Hf, Cr, Y, As, Pb, Al, Fe, Cu, Se, Sb, La, Ni, Co, Sb, Ta, Te, Ba, Sm, Nb, Hg, Cd, Sr, As and Se. In ceramics used in jewelry and watchmaking applications the concentrations found vary from one ceramic to another, including toxic elements such as Te, Ba, As, Pb, Sm, Hg and Cd, therefore being technical zirconia ceramics which are not intended for the medical field. For ceramics used in jewelry and watchmaking applications a screening identification test for Ni, Co, Cu and Fe with strips of type Merckoquant® (Merck, Kenilworth, NJ, USA) was also performed. The obtained data prove that the zirconia ceramics in question are far from being “inert”.

scholarly journals Phytochemicals Analysis and Minerals Present in the dried used as spices: Health Risk Implication in Northern of Iraq

2021 ◽  
Vol 15 (7) ◽  
pp. 2006-2013
Author(s):  
Ramal Ahmed Mustafa
Keyword(s):  
Inductively Coupled Plasma ◽  
Chemical Elements ◽  
Nigella Sativa ◽  
Daily Intake ◽  
Optical Emission ◽  
Food Preservation ◽  
Optical Emission Spectrometry ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Plasma Optical Emission Spectrometry

In this study, total concentrations of eleven chemical elements (Ba, Ca, Cu, Fe, K, Na, Mn, Ni, Zn, P and Mg) in common spices of Kalar city- Iraq were determined using inductively coupled plasma-optical emission spectrometry. This study indicates that spices are a good source of a combination of Ca, K, Na, P and Mg. The spices, Curcuma longa, Nigella Sativa and Elettaria cardamomum were found to be very good sources of essential trace elements like Fe, Zn and Mn. The concentrations of the all elements were within the WHO and FAO permissible levels. Therefore, health risks associated with these elements indicate that people would experience no potential risks due to consumption of the spices. Preliminary screening of phytochemicals has found plenty of secondary metabolites which are present in dry plant samples. EDI values of all the metals were found to be below the maximum tolerable daily intake (MTDI).The present review aims to provide a comprehensive summary of the most relevant and recent findings on spices and their active compounds in terms of targets and mode of action; in particular, their potential use in food preservation and enhancement of shelf life as a natural bio ingredient. Keywords: Spices, phytochemicals, food preservative, Minerals, Ash digestion, inductively coupled plasma – optical emission spectrometry, ICP-OES.

scholarly journals Improvement and modification of energy-dispersive x-ray fluorescence method for determination of metal elements in cement leachates - chemometric approach

2020 ◽  
pp. 67-67
Author(s):  
Nevenka Mijatovic ◽  
Anja Terzic ◽  
Lato Pezo ◽  
Ljiljana Milicic ◽  
Dragana Zivojinovic
Keyword(s):  
Inductively Coupled Plasma ◽  
Chemical Elements ◽  
Certified Reference Materials ◽  
Optical Emission ◽  
Fluorescence Method ◽  
Energy Dispersive ◽  
Emission Spectrometry ◽  
X Ray ◽  
Inductively Coupled ◽  
Plasma Optical Emission Spectrometry

A modification of analytical procedure for energy-dispersive X-ray fluorescence (EDXRF) quantification of ten chemical elements (As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Pb, Zn) in the leachates obtained from cement binders was developed. Twenty-nine testing samples were used in the experiment. All samples were based on Portland cement. Fly ash of different origin, zeolite and bentonite were employed as mineral additives in the cement binders. Distilled water was used as leachate. Validation of the modified EDXRF procedure was conducted in terms of limits of detection and quantification, working range, linearity, selectivity, precision, trueness, and robustness. Traceability of the procedure was established using certified reference materials. Uncertainty of measurement was confirmed via ?in-house? laboratory validation approach. The expanded uncertainties for ten analysed elements were obtained for entire working range of EDXRF method. Robustness of the modified EDXRF procedure was assessed by means of chemometric in-house approach. The results obtained by modified X-ray fluorescence method were additionally correlated to those acquired by inductively coupled plasma optical emission spectrometry to confirm that EDXRF can be used as an effective and reliable alternative method for analysis of cement leachates.

Advances in sample digestion using microwave-ultraviolet radiations: phosphorus and sulfur determination in animal feed

2020 ◽  
Vol 16 ◽  
Author(s):  
Diogo L. R. Novo ◽  
Priscila T. Scaglioni ◽  
Rodrigo M. Pereira ◽  
Filipe S. Rondan ◽  
Gilberto S. Coelho Junior ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Animal Feed ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Official Method ◽  
Dissolved Carbon ◽  
Inductively Coupled ◽  
Relative Standard ◽  
Wide Range ◽  
Sulfur Determination

Background: Conventional analytical methods for phosphorus and sulfur determination in several matrices present normally analytical challenges regarding inaccuracy, detectability and waste generation. Objective: The main objective is proposing a green and feasible analytical method for phosphorus and sulfur determination in animal feed. Methods: Synergic effect between microwave and ultraviolet radiations during sample preparation was evaluated for the first time for the animal feed digestion associated with further phosphorus and sulfur determination by ion chromatography with conductivity detection. Dissolved carbon and residual acidity in final digests were used for the proposed method assessment. Phosphorus and sulfur values were compared with those obtained using conventional microwave-assisted wet digestion in closed vessels associated with inductively coupled plasma optical emission spectrometry and with those obtained using Association of Official Analytical Chemists International official method. Recovery tests and certified reference material analysis were performed. Animal feeds were analyzed using the proposed method. Results: Sample masses of 500 mg were efficiently digested using only 2 mol L -1 HNO3. The results obtained by the proposed method was not differing significantly (p > 0.05) from those obtained by the conventional and official methods. Suitable recoveries (from 94 to 99%), agreement with certified values (101 and 104%) and relative standard deviations (< 8%) were achieved. Phosphorus and sulfur content in commercial products varied in a wide range (P: 5,873 to 28,387 mg kg-1 and S: 2,165 to 4,501 mg kg-1 ). Conclusion: The proposed method is a green, safe, accurate, precise and sensitive alternative for animal feed quality control.

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