Ultra-sensitive quantification of copper in food and water samples by electrochemical adsorptive stripping voltammetry

A new electrochemical adsorptive stripping voltammetry method was developed for the determination of trace amounts of copper in food and water samples. The study of electrochemical behavior of Cu ion indicated that Cu(II) and Schiff base formed a complex in H₃BO₄–NaOH buffer solution (pH?=?7.25). An accumulation potential of ?100 mV (vs Ag/AgCl) was applied while the solution was stirred for 60 s. The response curve was recorded by scanning the potential, and the peak current of ?0.31 V (vs Ag/AgCl) was recorded. The peak current and concentration of copper accorded with linear relationship in the range of 0.04–120 ng mL^?1. The relative standard deviation (for 12 ng mL^?1 of copper) was 1.73 %, and the detection limit was 0.007 ng mL^?1. The possible interference of some common ions was studied. The proposed method was applied to the determination of copper in water, rice, wheat, tea, milk, and tomato with satisfactory results.     

Sustainable Water Purification and Energy Generation Over Crystalline Chitosan Grafted Polyaniline Composite

Journal of Polymers and the Environment - The present research demonstrates the design and development of a dual-compartment water purification proto-plant for microbial degradation of organic...     

Advantages and prospective challenges of nanotechnology applications in fish cultures: a comparative review

Environmental Science and Pollution Research - Applications of nanotechnology in fish cultures have participated in getting over various difficulties that hinder fish productivity. They can achieve...     

Assessing the impact of mechanism of green public consumption policy on environmental equity: evidence from China

Environment, Development and Sustainability - This study investigates the impact of the mechanism of green public consumption policy on environmental equity and provides a feasible reference for...     

Conceptualizing sustainable–responsible tourism indicators: an interpretive structural modeling approach

Environment, Development and Sustainability - Despite decades of debate and theoretical and practical activity related to the sustainability of tourism, its implementation remains difficult. The...     

Global warming and export competitiveness of agriculture sector: evidence from heterogeneous econometric analysis of Pakistan

Environmental Science and Pollution Research - The increase in average annual temperature due to greenhouse gases emission is posing threat to the agriculture sector across the globe. Pakistan is...     

The role of environmental transformational leadership in employees’ influencing organizational citizenship behavior for environment well-being: a survey data analysis

Environmental Science and Pollution Research - Many researchers and intellectuals focused on the topic of organizational citizenship behavior for the environment (OCBE); however, employees’...     

Does financial development mitigate the effects of climate variability on rice cultivation? Empirical evidence from agrarian economy

Environmental Science and Pollution Research - This study is the first attempt to examine the effects of changing climate and financial development on rice cultivation in the context of agrarian...     

Citizens’ perceptions of trust relationships in the environmental management process in North Lebanon

This research investigates how trust plays a role in environmental management in North Lebanon, which has suffered repeated episodes of armed conflict in recent times. Previous studies have shown that environmental problems have increased and that the government has been unable to address these, even during periods of relative peace. We examined trust as a factor that contributes to, or hampers, environmental management. Our analysis drew on a survey in 2011 involving 499 citizens. The results demonstrated that, according to citizens, the lack of trust between citizens, and between citizens and the public sector, is a key factor obstructing effective environmental management. The results indicate the level of correlation between how trusting people are; how citizens participate; and how people perceive government legitimacy.     

Optimal conditions of Al and Fe extraction from laterite soil using D-optimal design

This paper reports pioneering work in identifying an alternative coagulation agent of wastewater treatment, given the availability of commonly used agents are of a higher cost relative to more natural sources, such as soil. The alternative proposed is laterite soil from northern Malaysia because it contains high amounts of Al and Fe, which are well-known coagulants. The soil was grinded and sieved to obtain uniform particle sizes of <250???m. Al and Fe were extracted from the soil. Extraction agents: (1) HCl, (2) NaOH, and (3) HCl?+?NaCl were chosen. It was found that the most effective agent to extract Fe was 5?N HCl while to extract Al was HCl?+?NaCl, 2 and 4?N, respectively. D-optimal design observed that extraction time t, temperature T, and ratio of amount of laterite soil to amount of extractants r, showed a significant effect on Al extraction. In contrast, the combination of factors t and r exhibited insignificant effect on Fe extraction while other factors were significant. The optimum conditions for extraction of both Al and Fe were 90?°C, 40?min, for r?=?1:15, which gave [Fe]?=?1,870?mg/l and [Al]?=?0.17?mg/l and 90?°C, 90?min, for r?=?1:10, which gave [Fe]?=?2,900?mg/l and [Al]?=?0.130?mg/l. Since concentration of Fe extracted from laterite soil was high, it was concluded that laterite soil can be considered as an alternative and novel source of coagulant applicable in a wastewater treatment coagulation process.