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Batch experiments showed that adsorption was spontaneous and conformed to the pseudo-second order kinetic model. Finally, mechanisms for the formation of GT-1 and the removal of As (V) by GT-1 were proposed.Tam Giang-Cau Hai lagoon is the largest lagoon in Viet Nam. It has two inlets that exchange water with the sea Thuan An inlet in the north and Tu Hien inlet in the south. Every year, Tam Giang-Cau Hai lagoon receives a large amount of wastewater from five coastal districts with various waste sources such as residences, aquaculture, livestock and industry among others. Due to the low water exchange through the two inlets, wastewater is discharged into the lagoon and pollutants accumulate in the water. This results in pollution concentrations in the water exceeding the environmental limits and causing adverse effects on aquatic life. This paper presents the environmental carrying capacity (ECC) of the lagoon based on calculations from the Delft-3D model using three scenarios 1) ECC following Vietnamese regulations; 2) maximum ECC or dangerous scenario (which the water body can no longer purify itself or becomes a dead water body); 3) proposed ECC for the protection of aquatic life. Based on the study results, some solutions have been proposed to protect the lagoon with the construction of wastewater treatment plants being the most important action to reduce pollution load in the lagoon.The buds and initial flowers of honeysuckle (Lonicera japonica Thunb.) are most widely used in traditional Chinese medicines (TCMs). In recent years, the problem of pesticide residues in honeysuckle has attracted much attention. This research aimed to study pesticide residual situation of honeysuckle in China and estimate the potential health risks for consumers using the HQ (hazard quotient) and HI (hazard index) methods. A reliable and robust method was established to determine and quantify 137 pesticide residues simultaneously by high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) for 151 honeysuckle samples from different planting bases in China in 2017 and 2018. Fifty-four pesticides were detected in total, including 10 unauthorized pesticides (chlorpyrifos, fipronil, carbofuran, omethoate, isofenphos-methyl, triazophos, methomyl, dimethoate, methidathion, and methamidophos). One hundred and fifty (99.3%) samples contained at least 1 and up to 31 pesticides and/or their metabolites, with concentrations ranging from 0.001 to 3.087 mg/kg. Carbendazim, chlorbenzuron, imidacloprid, chlorpyrifos, and acetamiprid were the most frequently detected pesticides in 2017 and 2018, and the corresponding detection rates were 95.31%, 64.06%, 65.63%, 53.13%, 57.81%, and 98.85%, 88.51%, 70.11%, 77.01%, 57.47%, respectively. The acute hazard quotient (HQa) of carbofuran was 1.54 for specific population (fetus, infants, and pregnant or nursing women), which indicated that it posed a potential acute health risk. In the cumulative risk assessment, the acute hazard index (HIa) of insecticides in honesuckle for children and the specific population were 1.34 and 3.36, respectively, suggesting that they posed potential acute cumulative health risks. Nintedanib research buy These results were of theoretical and practical value for evaluating the safety of honeysuckle and improving its quality and safety.This study aimed to determine cadmium (Cd) accumulation in arable soil, changes in Cd extractability and relevant soil properties, and Cd uptake by rice plants after long-term (50 years) application of phosphate (P) fertilizer and compost. A long-term field experiment was performed with rice crops from 1967 to 2016. Treatments included nitrogen and potassium fertilization (NK), nitrogen, phosphate, and potassium fertilization (NPK), nitrogen, phosphate, and potassium fertilization with compost application (NPK + compost), and control. Total Cd concentration in soil amended with NPK and NPK + compost continuously increased from 110 μg kg-1 up to 232 μg kg-1 from 1976 to 2016 but remained unchanged in control soil and soil amended with only NK. Plant-available Cd concentration in soil increased with year for all treatments, likely as a result of relevant changes in soil chemical properties. Cd concentrations in rice harvested in 2017 treated with NPK or NPK + compost were 212 μg Cd kg-1 and 223 μg Cd kg-1, respectively. These values exceed the maximum permissible level (200 μg Cd kg-1) established by the Ministry of Food and Drug Safety of Korea.Recognition of public preferences and the assessment of the river basin are valuable for efficient river basin management, and improvement in ecological attributes of river basin can provide considerable non-market benefits. Accordingly, the current study examines the heterogeneity in preferences and ranking of river ecosystem services amongst residents on the basis of their willingness to pay (WTP) to enhance these services. Given the different environmental and economic conditions of urban and rural residents in China, their views on ecological restoration differ. Various Likert scales were used to explore residents' perceptions and ranking of ecological attributes. Findings revealed that urban and rural residents care about water for their daily life, with the mean value of 2.08 and 2.10 and the lowest standard deviation of 1.63 and 1.59, respectively where the range of scale is '1 is the most important and 7 is the least important'. Agricultural and industrial water, weather management in Yangsha Lake, vegetation restoration, biodiversity conservation and downstream ecological protection were the next most imperative ecological attributes. Moreover, the results from random parameter logit (RPL) models show that river water quality has the highest marginal utility value, whereas recreational conditions have the lowest marginal utility value in all respondents' models. A considerable difference exists amongst urban and rural residents' WTP for improvements in ecological amenities. Amongst all households, lower basin residents prefer and value ecological attributes and are ready to pay whatever cost for restoration. Generally, urban residents have high implicit prices for most of river ecosystem attributes. Findings reveal that the policymakers should consider the existing preference heterogeneity when designing ecosystem payment plans and allocating resources.
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