Strontium and Strontium Compounds

Hibbins, Stephen G.

doi:10.1002/0471238961.1920181508090202.a01

Cited by 5 publications

(2 citation statements)

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“…Sr is an alkaline earth metal, usually in the form of SrSO4 and SrSO3 in the Earth's crust 67 (Jie et al 2014). A large number of digital cathode ray tubes are derived from SR (Hibbins 2000), so the source of Sr may be from YJQ sampling point. Factor 3, which explains only the contribution of 9.4% (Fig.…”

Section: Multivariate Statistical Analysismentioning

confidence: 99%

WITHDRAWN: Heavy Metals in Water and Surface Sediments of the Fenghe River Basin, China: Assessment and Source Analysis

Luo

Kang

et al. 2021

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This paper combines environmental science, inorganic chemistry, water quality monitoring and other disciplines, and uses several representative evaluation methods (WQI, Pn, I-geo, RI) for heavy metals in water and sediments. A preliminary assessment and source analysis of heavy metals (Cd, Cr, Fe, Mn, Zn, Cr, Ti, Ni, Cu, As, Pb, Sr) in water and surface sediments of the Fenghe River Basin, Shannxi Province, China was carried out in this study. Results indicate that most of the heavy metals in water are below national water quality standards. Exceptions include Mn, which exceeds national tertiary standards and Cr, which exceeds national drinking water standards. Most heavy metals in the sediments exceed the environmental standard values except Ni. Water quality index (WQI) and Nemero index (Pn) showed the same trend in contamination levels of sampling sites. According to the Geological Accumulation Index method (I-geo) and the Potential Ecological Risk Index method (RI), high concentrations of Cd poses a high ecological risk in some sampling locations. Pearson Correlation Analysis (CA), Hierarchical Clustering Analysis (HCA), Principal Component Analysis (PCA) and Positive Matrix Factorization (PMF) models are used to explore the relationships and sources of heavy metals. In general, upstream sources are similar, and middle and lower reaches are easily clustered into a large category except for some specific sampling points. For example, metals in sampling site FHK mainly come from surrounding residents and farms and heavy metals attributes in sampling site SLQ relate to the fact that municipal sewage is collected and treated. The factors or sources of heavy metals in water and sediment are revealed in detail through PMF models. In the water, the average contribution rate of these four source factors for heavy metals is 36.8%, 11.7%, 9.4% and 42.0%, while the average proportion of these four factors for heavy metals in sediment is 8.0%, 29.2%, 23.9% and 38.9% respectively. Results show that the main sources of pollution in the region are urban construction and transportation, electronics industry, machinery manufacturing, tourism and agriculture. These sectors should therefore be given sufficient attention in the prevention and management of heavy metal pollution.

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Section: Multivariate Statistical Analysismentioning

confidence: 99%

WITHDRAWN: Heavy Metals in Water and Surface Sediments of the Fenghe River Basin, China: Assessment and Source Analysis

Luo

Kang

et al. 2021

Preprint

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“…4 element of alkaline earth metals with the atomic number of 38. It is an essential microelement; the daily strontium intake by an adult is approximately 4 mg 26 . Strontium is poorly absorbed by the body, with an absorption level of approximately 25%–30%; thus, its content is only 0.035% of the calcium content.…”

Section: Physicochemical and Physiological Characteristics Of Alkalin...mentioning

confidence: 99%

Alkaline earth metals for osteogenic scaffolds: From mechanisms to applications

et al. 2023

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Regeneration of bone defects is a significant challenge today. As alternative approaches to the autologous bone, scaffold materials have remarkable features in treating bone defects; however, the various properties of current scaffold materials still fall short of expectations. Due to the osteogenic capability of alkaline earth metals, their application in scaffold materials has become an effective approach to improving their properties. Furthermore, numerous studies have shown that combining alkaline earth metals leads to better osteogenic properties than applying them alone. In this review, the physicochemical and physiological characteristics of alkaline earth metals are introduced, mainly focusing on their mechanisms and applications in osteogenesis, especially magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba). Furthermore, this review highlights the possible cross‐talk between pathways when alkaline earth metals are combined. Finally, some of the current drawbacks of scaffold materials are enumerated, such as the high corrosion rate of Mg scaffolds and defects in the mechanical properties of Ca scaffolds. Moreover, a brief perspective is also provided regarding future directions in this field. It is worth exploring that whether the levels of alkaline earth metals in newly regenerated bone differs from those in normal bone. The ideal ratio of each element in the bone tissue engineering scaffolds or the optimal concentration of each elemental ion in the created osteogenic environment still needs further exploration. The review not only summarizes the research developments in osteogenesis but also offers a direction for developing new scaffold materials.

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