Regime shift in aerosol ammonium between the rainy and dry season: Perspective from stable isotopes in bulk deposition

Zhou, Xin; Luo, Huijie; Chen, Fajin; Chen, Chunqing; Li, Zhiyang; Zhu, Qingmei; Lao, Qibin

doi:10.1016/j.apr.2022.101462

Cited by 7 publications

(1 citation statement)

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“…This is because, during the dry season, the river's water flow is often reduced, which reduces the diluting effect of pollutants such as the ammonium and phosphate, resulting in higher concentrations. According to a previous report, the concentrations of ammonium and phosphate were higher during the dry season than the rainy season [55][56][57]. This is also due to a combination of causes, including initial flushing runoff from human and animal waste and spring fertiliser application [57].…”

Section: Ammonium Phosphates and Coliformsmentioning

confidence: 92%

Surface water quality assessment in the Bach Dang river basin, Vietnam: using water quality index and geographical information system methods

Nguyen,

Tran,

Tap Van

et al. 2023

Environ. Res. Commun.

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The study evaluates the surface water quality of the Bach Dang river basin. During the rainy season, the temperature, pH, EC, BOD5, COD, coliforms, ammonium and phosphate values were 27–37 oC, 6.6–8.9, 300–2200 μS/cm, 5–25 mg/L, 5–26 mg/L, 0–3000 MPN/100mL, below 0.01 mg/L, and 0.02 mg/L, respective. During the rainy and dry seasons, Zn, Pb, Cr, As, Fe and Mn levels were below drinking water limits. In the rainy season, the water quality index varied from 76 to 91, signifying medium to excellent water quality. The most outstanding water quality sites were the QN12, QN18, and QN22. During the dry season, most areas had moderate to excellent (WQI values between 61 and 93), except for QN01, QN03, QN04, QN05, QN06, QN07, QN11, QN16, QN17, QN19, and QN23, where it dropped to moderate (61–73). The temperatures were greater and higher EC values in the southeast. The DO concentrations were higher in the northwest and southeast in both seasons. The southern and southeastern regions exhibited more excellent COD and BOD5 values than the western, southwest, north, and northeast regions. The ammonium concentrations were higher in the southeast. During the dry season, the phosphate levels exceeded the permissible limit in the west, southeast, east, and northeast. Coliforms were below acceptable in both seasons, with greater levels in the northwest and northeast during the dry season. In addition, the Zn and Pb are favorably associated with the As, Mn, ammonium and phosphate in the rainy season. The COD positively correlated with the coliforms and BOD5. In the dry season, the pH inversely correlated with the Pb and Fe positively. The ammonium correlated negatively with the DO and positively with the phosphates. The pH negatively connected with the alkalinity, while the As positively correlated with the BOD5 and COD.

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