High-sensitivity determination of Cd isotopes in low-Cd geological samples by double spike MC-ICP-MS

2020 ◽  
Vol 35 (4) ◽  
pp. 713-727 ◽  
Author(s):  
Decan Tan ◽  
Jian-Ming Zhu ◽  
Xiangli Wang ◽  
Guilin Han ◽  
Zhuo Lu ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Geological Samples ◽  
Sample Sizes ◽  
Accuracy And Precision ◽  
Icp Ms ◽  
Isotope Measurement ◽  
Cd Isotopes

The accuracy and precision of Cd isotope measurement at different injecting sample sizes.

Determination of Selected Phthalates in Some Commercial Cosmetic Products by HPLC-UV

2020 ◽  
Vol 23 (10) ◽  
pp. 1010-1022
Author(s):  
Emrah Dural
Keyword(s):  
High Performance ◽  
Phthalate Esters ◽  
High Sensitivity ◽  
Hplc Method ◽  
Cosmetic Products ◽  
Limit Of Quantification ◽  
Nail Polish ◽  
Accuracy And Precision ◽  
Butyl Phthalate

Aim and scope: Due to the serious toxicological risks and their widespread use, quantitative determination of phthalates in cosmetic products have importance for public health. The aim of this study was to develop a validated simple, rapid and reliable high-performance liquid chromatography (HPLC) method for the determination of phthalates which are; dimethyl phthalate (DMP), diethyl phthalate (DEP), benzyl butyl phthalate (BBP), di-n-butyl phthalate (DBP), di(2- ethylhexyl) phthalate (DEHP), in cosmetic products and to investigate these phthalate (PHT) levels in 48 cosmetic products marketing in Sivas, Turkey. Materials and Methods: Separation was achieved by a reverse-phase ACE-5 C18 column (4.6 x 250 mm, 5.0 μm). As the mobile phase, 5 mM KH2PO4 and acetonitrile were used gradiently at 1.5 ml min-1. All PHT esters were detected at 230 nm and the run time was taking 21 minutes. Results: This method showed the high sensitivity value the limit of quantification (LOQ) values for which are below 0.64 μg mL-1 of all phthalates. Method linearity was ≥0.999 (r2). Accuracy and precision values of all phthalates were calculated between (-6.5) and 6.6 (RE%) and ≤6.2 (RSD%), respectively. Average recovery was between 94.8% and 99.6%. Forty-eight samples used for both babies and adults were successfully analyzed by the developed method. Results have shown that, DMP (340.7 μg mL-1 ±323.7), DEP (1852.1 μg mL-1 ± 2192.0), and DBP (691.3 μg mL-1 ± 1378.5) were used highly in nail polish, fragrance and cream products, respectively. Conclusion: Phthalate esters, which are mostly detected in the content of fragrance, cream and nail polish products and our research in general, are DEP (1852.1 μg mL-1 ± 2192.0), DBP (691.3 μg mL-1 ± 1378.5) and DMP (340.7 μg mL-1 ±323.7), respectively. Phthalates were found in the content of all 48 cosmetic products examined, and the most detected phthalates in general average were DEP (581.7 μg mL-1 + 1405.2) with a rate of 79.2%. The unexpectedly high phthalate content in the examined cosmetic products revealed a great risk of these products on human health. The developed method is a simple, sensitive, reliable and economical alternative for the determination of phthalates in the content of cosmetic products, it can be used to identify phthalate esters in different products after some modifications.

scholarly journals Simultaneous Determination of C18 Fatty Acids in Milk by GC-MS

Separations ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 118
Author(s):  
Meiqing Chen ◽  
Yangdong Zhang ◽  
Fengen Wang ◽  
Nan Zheng ◽  
Jiaqi Wang
Keyword(s):  
Fatty Acids ◽  
High Sensitivity ◽  
Raw Milk ◽  
Uht Milk ◽  
Milk Samples ◽  
Accuracy And Precision ◽  
Different Temperatures ◽  
Chromatographic Resolution ◽  
Commercial Milk

The determination of C18 fatty acids (FAs) is a key and difficult aspect in FA profiling, and a qualified method with good chromatographic separation and high sensitivity, as well as easy methylation, is required. A GC-MS method was established to simultaneously determine C18 FAs in milk. To simplify the methylation protocol for milk samples, besides a base-catalyzation methylation (50 °C for 20 min), the necessity of an additional acid-catalyzation was also studied using different temperatures (60 °C, 70 °C, 80 °C, and 90 °C) and durations (90 min and 150 min). The results showed that the chromatographic resolution was improved, although three co-eluted peaks existed. The base-catalyzation was sufficient, and an additional acid-catalyzation was not necessary. The proposed method was validated with good sensitivity, linearity, accuracy, and precision, and then applied in determining C18 FAs in 20 raw milk and 30 commercial milk samples. UHT milk presented a different profile of C18 FAs from raw milk and PAS milk samples, which indicated that excessive heating could change the profile. Overall, the proposed method is a high-throughput and competent approach for the determination of C18 FAs in milk, and which presents an improvement in chromatographic resolution and sensitivity, as well as a simplification of methylation.

Precise and accurate determination of Sm, Nd concentrations and Nd isotopic compositions in geological samples by MC-ICP-MS

2011 ◽  
Vol 26 (6) ◽  
pp. 1237 ◽  
Author(s):  
Yue-Heng Yang ◽  
Zhu-Yin Chu ◽  
Fu-Yuan Wu ◽  
Lie-Wen Xie ◽  
Jin-Hui Yang
Keyword(s):  
Accurate Determination ◽  
Geological Samples ◽  
Isotopic Compositions ◽  
Icp Ms

scholarly journals Determination of Pt, Pd, Ru and Ir in geological samples by ID-ICP-MS using sodium peroxide fusion and Te co-precipitation

2003 ◽  
Vol 37 (5) ◽  
pp. 557-565 ◽  
Author(s):  
Liang Qi ◽  
D. Conrad Gregoire ◽  
Mei-Fu Zhou ◽  
John Malpas
Keyword(s):  
Geological Samples ◽  
Sodium Peroxide ◽  
Icp Ms ◽  
Co Precipitation

Determination of sub-ng g−1 Au in geological samples by ion molecule reaction ICP-MS and CH4 plasma modifier

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103189-103194 ◽  
Author(s):  
Wei Guo ◽  
Wenke Xie ◽  
Lanlan Jin ◽  
Qinghai Guo ◽  
Shenghong Hu
Keyword(s):  
Direct Determination ◽  
Geological Samples ◽  
Molecule Reaction ◽  
Icp Ms

Direct determination of Au in geological samples using a combination of ion molecule reaction ICP-MS and CH4 plasma modifier technique.

scholarly journals Determination of Silicon and Chromium in Gold Matrix Using Proton Induced X-Ray Emission

2021 ◽  
Vol 4 (4) ◽  
pp. 1-10
Author(s):  
Daniel D. ◽  
Bello A.
Keyword(s):  
Research And Development ◽  
High Sensitivity ◽  
Geological Samples ◽  
Energy Research ◽  
Single Spectrum ◽  
Mining Site ◽  
X Ray ◽  
Elemental Concentrations ◽  
Pixe Method

The research aimed at the determination of elemental concentrations of silicon and chromium in five geological samples at the mining site of Garin Awwal area using the method of PIXE for analyses. The choice PIXE method in this research was due to its high sensitivity and multi-element capability that analyzes any element from sodium to uranium in a single spectrum. PIXE technique of 2.5MeV proton beam was used to characterize five samples. Samples were irradiated and analyzed at Centre for Energy Research and Development, Ile-Ife, Osun State, Nigeria. From the Spectra and results generated, silicon and chromium are of commercial deposit in the area, alongside other elements such as Iron(Fe), Magnesium(Mg) and Aluminium(Al) which appear to be deposited in commercial quantities in the area.

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