The impact of seasonal change on river water quality and dissolved metals in mountainous agricultural areas and risk to human health

Razali, Azlini; Ismail, Sharifah Norkhadijah Syed; Awang, Suriyani; Praveena, Sarva Man­gala; Abidin, Emilia Zainal

doi:10.1080/15275922.2020.1728434

Cited by 11 publications

(4 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The rivers in the Western and Eastern areas of the island are most affected (Nurul-Ruhayu et al 2015 ). Razali et al ( 2020 ) conducted a study that confirmed the sources of river water pollution were agricultural activity associated with landslides, soil erosion, and land clearance. In addition to that, a study conducted by Muhamad et al ( 2020 ) found the status of the Penang River is polluted, which is classified as class V.…”

Section: Methodsmentioning

confidence: 99%

Surface water quality status and prediction during movement control operation order under COVID-19 pandemic: Case studies in Malaysia

Najah

Teo

Fai

et al. 2021

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Global concerns have been observed due to the outbreak and lockdown causal-based COVID-19, and hence, a global pandemic was announced by the World Health Organization (WHO) in January 2020. The Movement Control Order (MCO) in Malaysia acts to moderate the spread of COVID-19 through the enacted measures. Furthermore, massive industrial, agricultural activities and human encroachment were significantly reduced following the MCO guidelines. In this study, first, a reconnaissance survey was carried out on the effects of MCO on the health conditions of two urban rivers (i.e., Rivers of Klang and Penang) in Malaysia. Secondly, the effect of MCO lockdown on the water quality index (WQI) of a lake (Putrajaya Lake) in Malaysia is considered in this study. Finally, four machine learning algorithms have been investigated to predict WQI and the class in Putrajaya Lake. The main observations based on the analysis showed that noticeable enhancements of varying degrees in the WQI had occurred in the two investigated rivers. With regard to Putrajaya Lake, there is a significant increase in the WQI Class I, from 24% in February 2020 to 94% during the MCO month of March 2020. For WQI prediction, Multi-layer Perceptron (MLP) outperformed other models in predicting the changes in the index with a high level of accuracy. For sensitivity analysis results, it is shown that NH3-N and COD play vital rule and contributing significantly to predicting the class of WQI, followed by BOD, while the remaining three parameters (i.e. pH, DO, and TSS) exhibit a low level of importance.

show abstract

Section: Methodsmentioning

confidence: 99%

Surface water quality status and prediction during movement control operation order under COVID-19 pandemic: Case studies in Malaysia

Najah

Teo

Fai

et al. 2021

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…However, this pollution reduction effect did not remain consistent in the middle of 2018, but increased again to 48% at the end of the year. Water temperature, different human activities in dry and wet seasons, and the Spring Festival between January and February all contribute to this seasonal fluctuation of water quality (Crosa et al, 2006; Razali et al, 2020; Wu et al, 2016). However, these environmental and social factors apply to all river sites in our sample, so they do not harm the internal validity of this study.…”

Section: Resultsmentioning

confidence: 99%

The effectiveness of network administrative organizations in governing interjurisdictional natural resources

Liu

Tan

2022

Public Administration

View full text Add to dashboard Cite

Can network administrative organizations (NAOs) improve networks' ability to solve complex social and environmental problems? This is a classical question in collaborative governance. The public management literature examines collaborative outcomes at either the organization or the entire network level, but has not addressed “edge level” outcomes to evaluate structured interactions among network actors. Therefore, we investigate outcomes in an interjurisdictional area that reflect collaborative efforts between local governments. Recently, Guangdong Province in China enacted the River Chief System, an institutional reform that mandates the provincial government to establish an NAO to coordinate intercity rivers' management. To assess how well the reform has worked to reduce pollution, we employ the synthetic control method using monthly water quality data from 14 river monitoring sites in two neighboring cities. Our results indicate that the reform reduced the interjurisdictional river sites' pollution level effectively by 36% in the following year. This preliminary finding contributes to the collaborative governance theory and provides new evidence on whether the NAO model improves the shared outcomes between local governments.

show abstract

“…PMI y PMIV muestran los menores valores, probablemente debido a la cercanía de la primera estación a las fuentes de contaminación por descargas mineras y la descarga de aguas residuales en la cuarta estación, provenientes de pequeños centros poblados de la zona. Cuando el potencial de óxido reducción es bajo, como en este caso, la toxicidad de ciertos metales y contaminantes puede aumentar y hay una gran cantidad de material en proceso de descomposición en el agua que no se puede eliminar [32].…”

Section: Discussionunclassified

Distribución De Metales Pesados Y Metaloides en Aguas Superficiales Y Sedimentos Del Río Crucero, Perú

2020

View full text Add to dashboard Cite

La acumulación de contaminantes inorgánicos en los compartimientos ambientales representa un grave problema a nivel mundial, pues generalmente proceden de actividades urbanas e industriales con un manejo inadecuado de sus residuos. Los metales pesados son contaminantes inorgánicos prioritarios cuya acumulación y distribución en cuerpos de agua dulce pueden volverlos potencialmente peligrosos, produciendo toxicidad al llegar a organismos vivos que componen la cadena trófica. El río Crucero está ubicado en el departamento de Puno, Perú, confluye con otros ríos pertenecientes a la Cuenca Ramis, cuya desembocadura se encuentra en el Lago Titicaca. En este río se vierten descargas de aguas residuales procedentes de actividades mineras, urbanas y rurales. Para el estudio se tomó en cuenta la estación seca (mayo 2017), se seleccionaron cinco estaciones de muestreo a lo largo del río y se determinaron los parámetros fisicoquímicos in situ básicos incluyendo pH, temperatura, conductividad eléctrica y redox. Se recolectaron muestras de agua y sedimentos superficiales y se analizó la concentración de metales pesados (cadmio, zinc y arsénico) presentes en las muestras mediante espectroscopía de emisión atómica de plasma acoplado por inducción. Los resultados mostraron que el agua bajo escrutinio no era apta para consumo humano, hecho comprobado por valores de pH mayores a 8.5, los cuales incumplen las regulaciones establecidas por la organización mundial de la salud (OMS). Por otra parte, la concentración de metales en agua no excede los estándares de calidad ambiental nacionales ni los valores de criterios externos al país; sin embargo, existe certeza de contaminación con arsénico, cadmio y zinc en sedimentos bajo las regulaciones nacionales e internacionales.

show abstract

The impact of seasonal change on river water quality and dissolved metals in mountainous agricultural areas and risk to human health

Cited by 11 publications

References 31 publications

Surface water quality status and prediction during movement control operation order under COVID-19 pandemic: Case studies in Malaysia

Surface water quality status and prediction during movement control operation order under COVID-19 pandemic: Case studies in Malaysia

The effectiveness of network administrative organizations in governing interjurisdictional natural resources

Distribución De Metales Pesados Y Metaloides en Aguas Superficiales Y Sedimentos Del Río Crucero, Perú

Contact Info

Product

Resources

About