scholarly journals Detection of trace arsenic in drinking water: challenges and opportunities for microfluidics

2021 ◽  
Author(s):  
Nevetha Yogarajah ◽  
Scott S. H. Tsai
Keyword(s):  
Drinking Water ◽  
World Health Organisation ◽  
Arsenic Contamination ◽  
Ease Of Use ◽  
World Health ◽  
Arsenic Detection ◽  
Routine Monitoring ◽  
Challenges And Opportunities ◽  
Sensitivity And Selectivity ◽  
Economic Constraints

Arsenic contamination of drinking water is a major global problem, with contamination in Bangladesh deemed most serious. Although the current World Health Organisation (WHO) maximum contamination limit (MCL) for arsenic in drinking water is 10 μg L−1, due to practical and economic constraints, the standard limit in Bangladesh and many other developing nations is 50 μg L−1. We propose that an ideal arsenic sensor, designed for routine monitoring, will have five essential qualities: sensitivity and selectivity for arsenic; speed and reliability; portability and robustness; reduced health and environmental risks; and affordability and ease of use for local technicians. It is our opinion that many of these characteristics can be accentuated by microfluidic systems. We describe candidate colorimetric, electrochemical, biological, electrophoretic, surface-sensing, and spectroscopic methods for arsenic detection; and comment on their potential for portable microfluidic adaptation. We also describe existing developments in the literature towards the ultimate creation of microfluidic total analysis systems (μTASs) for arsenic detection. The fundamental purpose of this review is to highlight the need for better portable arsenic contamination detection, and describe how microfluidic technology may be developed to address this need.

scholarly journals Detection of trace arsenic in drinking water: challenges and opportunities for microfluidics

2021 ◽  
Author(s):  
Nevetha Yogarajah ◽  
Scott S. H. Tsai
Keyword(s):  
Drinking Water ◽  
World Health Organisation ◽  
Arsenic Contamination ◽  
Ease Of Use ◽  
World Health ◽  
Arsenic Detection ◽  
Routine Monitoring ◽  
Challenges And Opportunities ◽  
Sensitivity And Selectivity ◽  
Economic Constraints

Arsenic contamination of drinking water is a major global problem, with contamination in Bangladesh deemed most serious. Although the current World Health Organisation (WHO) maximum contamination limit (MCL) for arsenic in drinking water is 10 μg L−1, due to practical and economic constraints, the standard limit in Bangladesh and many other developing nations is 50 μg L−1. We propose that an ideal arsenic sensor, designed for routine monitoring, will have five essential qualities: sensitivity and selectivity for arsenic; speed and reliability; portability and robustness; reduced health and environmental risks; and affordability and ease of use for local technicians. It is our opinion that many of these characteristics can be accentuated by microfluidic systems. We describe candidate colorimetric, electrochemical, biological, electrophoretic, surface-sensing, and spectroscopic methods for arsenic detection; and comment on their potential for portable microfluidic adaptation. We also describe existing developments in the literature towards the ultimate creation of microfluidic total analysis systems (μTASs) for arsenic detection. The fundamental purpose of this review is to highlight the need for better portable arsenic contamination detection, and describe how microfluidic technology may be developed to address this need.

scholarly journals Improving Risk Assessments by Sanitary Inspection for Small Drinking-Water Supplies—Qualitative Evidence

Resources ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 71 ◽  
Author(s):  
Katherine Pond ◽  
Richard King ◽  
Jo Herschan ◽  
Rosalind Malcolm ◽  
Rory Moses McKeown ◽  
...  
Keyword(s):  
Drinking Water ◽  
Assessment Tool ◽  
World Health Organisation ◽  
Ease Of Use ◽  
World Health ◽  
Remedial Action ◽  
Water Supplies ◽  
Qualitative Evidence ◽  
Operations And Maintenance

Small drinking-water supplies face particular challenges in terms of their management. Being vulnerable to contamination but often not monitored regularly nor well-maintained, small drinking-water supplies may pose consequences for health of users. Sanitary inspection (SI) is a risk assessment tool to identify and manage observable conditions of the water supply technology or circumstances in the catchment area that may favour certain hazardous events and introduce hazards which may become a risk to health. This qualitative research aimed to identify the strengths and weaknesses of the SI tool as published by the World Health Organisation to inform a review and update of the forms and to improve their robustness. The study identified a number of benefits of the approach, such as its simplicity and ease of use. Challenges were also identified, such as potential for inconsistencies in perception of risk between inspectors, in interpreting questions, and lack of follow-up action. The authors recommend a revision of the existing SI forms to address the identified challenges and development of complementary advice on possible remedial action to address identified risk factors and on basic operations and maintenance.

Detection of trace arsenic in drinking water: challenges and opportunities for microfluidics

2015 ◽  
Vol 1 (4) ◽  
pp. 426-447 ◽  
Author(s):  
Nevetha Yogarajah ◽  
Scott S. H. Tsai
Keyword(s):  
Drinking Water ◽  
Sample Preparation ◽  
Signal Acquisition ◽  
Sample Analysis ◽  
Arsenic Detection ◽  
Challenges And Opportunities ◽  
Total Analytical System ◽  
Analytical System

Conception of a micro total analytical system (μTAS), capable of sample preparation, sample analysis, and signal acquisition, for portable trace arsenic detection.

scholarly journals Arsenic contamination in India: Causes, effects and treatment methods

2021 ◽  
Vol 13 (1) ◽  
pp. 146-152
Author(s):  
Rishabh Tiwari ◽  
Satwik Satwik ◽  
Prateek Khare ◽  
Satyam Rai
Keyword(s):  
Drinking Water ◽  
Arsenic Contamination ◽  
World Health ◽  
Arsenic Adsorption ◽  
Oxidation Treatment ◽  
Treatment Methods ◽  
Keywords Arsenic ◽  
The World ◽  
Contaminated Drinking Water ◽  
Health Organization

Herein the present study focuses on arsenic (As) contamination in groundwater, which plagues a vast section of the population of the world. Even the conservative estimates by the World Health Organization (WHO) estimate the number of people plagued by arsenic contaminated drinking water to be around 140-200 million. The Ganga- Brahmaputra fluvial plains in India and Padma-Meghna fluvial plains in Bangladesh are said to be one of the worst groundwater calamities to the humans. The Arsenic levels in drinking water in some of the most populated states in India are disproportionately higher than those defined by WHO guidelines. The paper, thus, delves into the anomaly in permissible limits defined by WHO and regional governments and its consequential effects. It briefly analyses the major sources of Arsenic contamination and its health effects in India. The study also looks closely into the states and districts plagued by the As contamination and explores the prominent treatment methods employed in as removal from the drinking water. Keywords: Arsenic, Adsorption, Geogenic, Arsenopyrite, Oxidation treatment

scholarly journals Comparative Studies of Water and Sediment Qualities of Some Dams in Kwara State

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
N Abdus-Salam
Keyword(s):  
Heavy Metals ◽  
Drinking Water ◽  
Oxygen Demand ◽  
Anthropogenic Pollution ◽  
World Health Organisation ◽  
World Health ◽  
Total Hardness ◽  
Who Guidelines ◽  
Water And Sediment

Potable water is becoming progressively scarce due to anthropogenic pollution and it has necessitated monitoring of water quality of rivers and dams as a subject of ongoing concern and research. This study was conducted to assess the quality of water collected from four different dams (Agba, Igbaja, Oloru and Omu-Aran) in Kwara State, Nigeria using standard procedures. Water and sediment samples were collected from three different spatial locations on the dams. The average values of most physicochemical parameters like pH, temperature, Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), Total Dissolved Solid (TDS), Total Hardness (TH), Alkalinity, some nutrients such as chloride (Cl-), sulphate (SO42-), phosphate (PO43-), nitrate (NO3-) and some heavy metals such as Cu, Zn have values that were within World Health Organisation (WHO) guidelines for drinking water for each of the dams while Cd and Fe concentrations were observed to be much higher than WHO guidelines for drinking water. This could be as a result of anthropogenic input. The dams’ sediments analyzed for heavy metals showed that Mn, Zn and Cd were high in the dams, which can be easily washed into the water body through leaching, thereby causing detrimental effect to the consumers.

scholarly journals An international review of the challenges associated with securing buy-in for water safety plans within providers of drinking water supplies

2010 ◽  
Vol 8 (2) ◽  
pp. 387-398 ◽  
Author(s):  
Corinna Summerill ◽  
Jen Smith ◽  
James Webster ◽  
Simon Pollard
Keyword(s):  
Drinking Water ◽  
World Health Organisation ◽  
World Health ◽  
International Review ◽  
Water Safety ◽  
Financial Efficiency ◽  
The Public ◽  
Quality Guidelines ◽  
The World ◽  
Water Safety Plans

Since publication of the 3rd Edition of the World Health Organisation (WHO) Drinking Water Quality guidelines, global adoption of water safety plans (WSPs) has been gathering momentum. Most guidance lists managerial commitment and ‘buy-in’ as critical to the success of WSP implementation; yet the detail on how to generate it is lacking. This commentary discusses aspects of managerial commitment to WSPs. We argue that the public health motivator should be clearer and a paramount objective and not lost among other, albeit legitimate, drivers such as political or regulatory pressures and financial efficiency.

scholarly journals Household’s Willingness to Pay for Safe Drinking Water: A Case Study of Abbottabad District

2007 ◽  
Vol 46 (4II) ◽  
pp. 1137-1153 ◽  
Author(s):  
Mirajul Haq ◽  
Usman Mustafa ◽  
Iftikhar Ahmad
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Rural Areas ◽  
Urban Areas ◽  
Human Life ◽  
National Income ◽  
World Health Organisation ◽  
World Health ◽  
Safe Drinking Water ◽  
Diarrhoeal Diseases

Drinking water is the basic need of human life. Safe drinking water is an essential component of primary health care and have vital role in poverty alleviation. There is positive correlation between increased national income and the proportion of population with access to improved water supply. An increase of 0.3 percent investment in household access to safe drinking water generates one percent increase in GDP. Whereas, provision of safe drinking water supply is an effective health intervention reduces the mortality caused by water-borne diseases by an average 70 percent. Inadequate drinking water not only resulted in more sickness and deaths, but also augments health costs, lower worker productivity and school enrolment [World Bank (1994)]. The World Health Organisation (WHO) estimate 1.8 million people in developing countries die every year from diarrhea and cholera, Out of these 90 percent are children under the age of five years. While 88 percent of diarrhoeal diseases are attributed to unsafe water supply, inadequate sanitation and hygiene [WHO (2004)]. The situation is not very different in Pakistan; the access to safe drinking water is estimated to be available to 23.5 percent of population in rural areas and 30 percent in urban areas. While every year 0.2 million children die due to diarrhoeal diseases [Rosemann (2005)].

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