Groundwater quality assessment for drinking purposes: a case study in the Mekong Delta, Vietnam.

Groundwater serves as an important resource for people in the Mekong Delta, but its quality has been continuously declined from human activities. Current status of the groundwater quality needs to be evaluated for sustainable groundwater resource management. This study aimed to evaluate the groundwater quality for drinking purposes in the Mekong Delta, Vietnam, using multivariate statistical methods and integrated-weight water quality index.

Combination of water quality, pollution indices, and multivariate statistical techniques for evaluating the surface water quality variation in Can Tho City, Vietnam.

This study assessed the surface water quality in Can Tho city, Vietnam, using a combination of water quality, pollution indices, and multivariate statistical methods. Surface water samples were collected at 38 locations with a frequency of 4 times in 2020 (March, June, September, and December) and at the time of high and low tides to analyze for 18 indicators. Results showed that surface water in Can Tho city was contaminated with organic matters and microorganisms.

Assessment of pollution levels and ecological potential risk of the soil influenced by landfilling in a Vietnamese Mekong Delta province.

The study was conducted to assess the impacts of Cai Dau and An Cu landfills in An Giang province, Vietnam on soil quality using relative soil quality index (RSQI), potential ecological risk index (PERI), and multivariable statistical methods and associated health risks. Forty-eight soil samples were collected in two layers: A (0-20 cm) and B (60-80 cm) and analyzed for five physiochemical soil parameters and eight heavy metals during the rainy and dry seasons. The results showed that pH fluctuated from weak acid to neutral, and organic matters and nutrients in soil were from poor to moderate.

Sensitivity of cholinesterase activity in juvenile giant freshwater prawn (Macrobrachium rosenbergii de Man, 1879) to organophosphate diazinon.

Pesticides containing diazinon are frequently used in agriculture in the Vietnamese Mekong delta region leading to their potential residual occurrence in the environment. Under laboratory conditions, exposure to diazinon has been shown to result in adverse inhibition of cholinesterase enzyme (ChE) activity and subsequent death in several fish species. This study investigated a 96-h median lethal concentration (LC50) of diazinon concentrations from 0.

Classification of water quality in low-lying area in Vietnamese Mekong delta using set pair analysis method and Vietnamese water quality index.

A rational water quality assessment program directly affects a success of a national socio-economic development strategy. This study was aimed to evaluate and classify surface water quality in Dong Thap province, Vietnam, using set pair analysis (SPA) and national water quality index (WQI_VN) methods. The water quality data was collected at 58 locations in 2019 by the Department of Natural Resources and Environment of Dong Thap province.

Reduction of silver nanoparticle toxicity affecting ammonia oxidation using cell entrapment technique.

Occurrence of silver nanoparticles (AgNPs) in wastewater treatment systems could impact the ammonia oxidation (AO). This study investigated the reduction of AgNPs and dissociated silver ion (Ag) toxicity on nitrifying sludge using cell entrapment technique. Three entrapment materials, including barium alginate (BA), polyvinyl alcohol (PVA), and a mixture of polyvinyl alcohol and barium alginate (PVA-BA), were applied.

Influence of silver nanoparticles and liberated silver ions on nitrifying sludge: ammonia oxidation inhibitory kinetics and mechanism.

Silver nanoparticles (AgNPs) are widely used in commercial products because of their excellent antimicrobial activity. Entrance of AgNPs and its released Ag ions (Ag) into wastewater treatment plants could harm ammonia oxidation (AO) process resulting in environmental problems. This study investigated inhibitory kinetics and mechanism of AO from nitrifying sludge influenced by AgNPs and Ag.

Renal fluid overload diagnosed by retinal optical coherence tomography scanning.

Fluid overload is one of the major findings in patients with end-stage renal disease. Common findings in fluid overload include shortness of breath, pedal edema, ascites, and pericardial effusion. Rarely, vision loss can be associated with decompensated systemic fluid status.

Intravitreal Injection-Induced Migraine Headaches.

A case of migraine headache triggered by intravitreal injection, and aborted by retrobulbar injection, is reported. To date, migraine and related cephalgia have not been reported after intravitreal injection. Ophthalmologists and neurologists should be aware of this potential sequela of a very common procedure.