Leaching behavior and environmental safety evaluation of fluorine ions from shotcrete with high-fluorine alkali-free liquid accelerator

2021 ◽  
Author(s):  
Renhe Yang ◽  
Tingshu He
Keyword(s):  
Safety Evaluation ◽  
Environmental Safety ◽  
Leaching Behavior ◽  
Fluorine Ions

scholarly journals Deformation Response and Safety Evaluation of Buildings Affected by Subway-Station Construction

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Chunlei Feng ◽  
Dingli Zhang ◽  
Hualao Wang ◽  
Xuan Zhang
Keyword(s):  
Relative Position ◽  
Evaluation Method ◽  
Safety Evaluation ◽  
Environmental Safety ◽  
Horizontal Distance ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Degree Of Deformation ◽  
Beijing Area ◽  
Subway Stations

Based on the sand and pebble stratum in the Beijing area, this paper studies the interaction between deep-foundation-pit excavation for subway stations and surrounding buildings using an orthogonal test. Moreover, it considers the relative position relationship between buildings and how the foundation pit is set up as well as different design schemes for foundation pits and the surrounding buildings. Results show that the horizontal distance s between the building and foundation pit and stiffness of the building itself have a clear impact on the differential settlement δij and relative deflection Δ, and the degree of deformation of the building near the corner of the foundation pit is complex. Simultaneously, based on numerical simulation results, the deformation characteristics and degree of deformation of the building under different relative position relationships with the foundation pit are analyzed. Finally, by establishing a relationship among the comprehensive deformation index Dj, surrounding environmental safety evaluation index Sj, and scheme safety grade Lj, a multiangle safety evaluation method for buildings affected by foundation-pit construction is formed, which can provide a reference for the research and design of similar projects.

Glyphosate Residues in Soil and Air: An Integrated Review

2020 ◽  
Author(s):  
Evagelia Tzanetou ◽  
Helen Karasali
Keyword(s):  
Degradation Product ◽  
Critical Review ◽  
Safety Evaluation ◽  
Environmental Safety ◽  
Soil Ecosystem ◽  
Aminomethylphosphonic Acid ◽  
The Relationship ◽  
Surface And Groundwater ◽  
Major Degradation Product

Glyphosate [N-(phosphonomethyl) glycine] (GPS) is currently the most commonly applied herbicide worldwide. Given the widespread use of glyphosate, the investigation of the relationship between glyphosate and soil ecosystem is critical and has great significance for its valid application and environmental safety evaluation. However, although the occurrence of glyphosate residues in surface and groundwater is rather well documented, only few information are available for soils and even fewer for air. Due to this, the importance of developing methods that are effective and fast to determine and quantify glyphosate and its major degradation product, aminomethylphosphonic acid (AMPA), is emphasized. Based on its structure, the determination of this pesticide using a simple analytical method remains a challenge, a fact known as the “glyphosate paradox.” In this chapter a critical review of the existing literature and data comparison studies regarding the occurrence and the development of analytical methods for the determination of pesticide glyphosate in soil and air is performed.

The Environmental Safety Evaluation on Heavy Metal Leaching of Deteriorated Concrete under Severe Conditions

2013 ◽  
Vol 25 (5) ◽  
pp. 539-546
Author(s):  
Yun-Wang Choi ◽  
Sung-Rok Oh ◽  
Man-Seok Park ◽  
Sang-Chel Kim ◽  
Sang-Hwa Jung
Keyword(s):  
Heavy Metal ◽  
Safety Evaluation ◽  
Environmental Safety ◽  
Metal Leaching ◽  
Heavy Metal Leaching

scholarly journals Analysis of Achyranthes aspera leaf extract and environmental safety evaluation to non target Nile tilapia fish fingerlings, Oreochromis niloticus.

2021 ◽  
Author(s):  
Belayhun Mandefro ◽  
Mereta Seid Tiku ◽  
Dawit Fremichael ◽  
Workineh M. Fereja ◽  
Argaw Ambelu
Keyword(s):  
Survival Data ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Safety Evaluation ◽  
Probit Model ◽  
Environmental Safety ◽  
Dose Limit ◽  
Achyranthes Aspera ◽  
Leaf Aqueous Extract ◽  
Toxicological Studies

Abstract Background: Although plant molluscicides are biodegradable and less toxic to higher animals, unregulated applications could affect other non target aquatic species. Eco toxicological studies are required to evaluate whether they are safe to those economically and ecologically important fish species. According to previous studies, Achyranthes aspera is a molluscicidal plant with LC90 of 96.5 mg/L and the current study is to investigate its toxic effect to Nile tilapia fish fingerlings, Oreochromis niloticus. Methods: Seven fish fingerlings were exposed to serial dilutions of A. aspera leaf aqueous extract for 96 hours in duplicate setup. Phytoconstituents were identified by GC-MS and lethal concentrations were determined by probit model. The NOAEC was determined by hypothesis testing on the survival data. Results: The respective piscicidal LC1, LC10 and LC50 values were 897.4, 1063.9 and 1310.74 mg/L. The NOAEC was 1100 mg/L (p>0.05). GC-MS analysis revealed 12 phytoconstituents including a monoterpene. Conclusion: The result shows that A. aspera is non toxic and hence is safe to Nile tilapia fish especially at its molluscicidal dose limit (96.5 mg/L LC90) corroborating to the plant’s target specific molluscicidal potential.

Safety Evaluation of Underground Environment Using Fuzzy Approach with Dynamic Weight

2011 ◽  
Vol 347-353 ◽  
pp. 3815-3820
Author(s):  
Ke Lei Sun ◽  
Hong Tao Zhang ◽  
Na Wang
Keyword(s):  
Evaluation Method ◽  
Influence Factors ◽  
Safety Evaluation ◽  
Environmental Safety ◽  
Coal Industry ◽  
Fuzzy Evaluation ◽  
Evaluation Indexes ◽  
Dynamic Weight ◽  
Weight Method ◽  
Available Information

Evaluating underground environmental safety is not an easy task as it involves many variable evaluation indexes which are immeasurable, vague and uncertain. Also, the available information for evaluation may be incomplete due to the difficulty of underground data acquisition and complexity of the influence factors. Considering the different effect of various evaluation indexes on underground environmental safety in different conditions, a dynamical weight algorithm of various indexes is presented. The fuzzy evaluation method with dynamic weight is applied in evaluating underground environmental safety at one of the coal mines in YangQuan coal industry. Findings conclude that the proposed dynamic weight method is better than the traditional method, which gives a promising prospect in underground environmental safety evaluation. And it provides a more reasonable and intelligent evaluation with accurate results.

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