Molybdenum background and pollution levels in the Taipu River, China

Li, Feipeng; Wang, Yue; Mao, Lingchen; Hong, Tao; Chen, Mengmeng

doi:10.1007/s10311-021-01365-x

Cited by 14 publications

(9 citation statements)

References 32 publications

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“…Observable higher PFAS concentrations were detected in tap water from reservoir C, which could be explained by the presence of possible point sources in the area. There are high-density point sources, such as chemical industries and textile industries, close to Taipu River, which connect to reservoir C, Tai Lake and Huangpu River, , which could be potential contributors to the high EF concentrations in tap water from reservoir C. The compositions of different PFAS decreased in the order of ultra-short PFAS (<C4, 98 ± 0.42%) > PFCAs (≥C4, 1.53 ± 0.34%) > PFSAs (≥C4, 0.26 ± 0.10%) > other PFAS (0.03 ± 0.02%). TFA was the largest contributor, accounting for more than 91% of ΣPFAS in all samples, with average concentrations ranging from 1.74 to 7.08 μg/L, which was on the same order of magnitude as a previous study on TFA in tap water from Shanghai .…”

Section: Resultsmentioning

confidence: 99%

Further Insight into Extractable (Organo)fluorine Mass Balance Analysis of Tap Water from Shanghai, China

Jiao,

Larsson,

Wang

et al. 2023

Environ. Sci. Technol.

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The ubiquitous occurrence of per-and polyfluoroalkyl substances (PFAS) and the detection of unexplained extractable organofluorine (EOF) in drinking water have raised growing concerns. A recent study reported the detection of inorganic fluorinated anions in German river systems, and therefore, in some samples, EOF may include some inorganic fluorinated anions. Thus, it might be more appropriate to use the term "extractable fluorine (EF) analysis" instead of the term EOF analysis. In this study, tap water samples (n = 39) from Shanghai were collected to assess the levels of EF/EOF, 35 target PFAS, two inorganic fluorinated anions (tetrafluoroborate (BF 4 − ) and hexafluorophosphate (PF 6 − )), and novel PFAS through suspect screening and potential oxidizable precursors through oxidative conversion. The results showed that ultra-short PFAS were the largest contributors to target PFAS, accounting for up to 97% of ΣPFAS.To the best of our knowledge, this was the first time that bis(trifluoromethanesulfonyl)imide (NTf 2 ) was reported in drinking water from China, and p-perfluorous nonenoxybenzenesulfonate (OBS) was also identified through suspect screening. Small amounts of precursors that can be oxidatively converted to PFCAs were noted after oxidative conversion. EF mass balance analysis revealed that target PFAS could only explain less than 36% of EF. However, the amounts of unexplained extractable fluorine were greatly reduced when BF 4 − and PF 6 − were included. These compounds further explained more than 44% of the EF, indicating the role of inorganic fluorinated anions in the mass balance analysis. KEYWORDS: extractable fluorine (EF), tetrafluoroborate (BF 4 − ), hexafluorophosphate (PF 6 − ), suspect screening, bis(trifluoromethanesulfonyl)imide (NTf 2 ), ultra-short PFAS

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Section: Resultsmentioning

confidence: 99%

Further Insight into Extractable (Organo)fluorine Mass Balance Analysis of Tap Water from Shanghai, China

Jiao,

Larsson,

Wang

et al. 2023

Environ. Sci. Technol.

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“…A total of 143 surface sediments were collected from Taipu River and its associated lakes in 2018, 2020, and 2021 during flood and non-flood seasons. Many industries along the river, including textile, printing and dyeing, machinery, and hardware, are potential contributors of heavy metals which become enriched in sediments [ 27 ]. Surface sediments were collected by a grab sampler based on the industrial distribution and the relationship between the river and lake, and handheld GPS was used to record the location ( Figure 1 ).…”

Section: Methodsmentioning

confidence: 99%

Co-Effects of Hydrological Conditions and Industrial Activities on the Distribution of Heavy Metal Pollution in Taipu River, China

Yao

Chen

Mao

et al. 2022

IJERPH

Self Cite

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In Taipu River, after being transformed from a drainage channel to a drinking water supply river in 1995, heavy metals that have accumulated in sediments have become an environmental issue. Herein, we collected sediments of Taipu River in 2018, 2020, and 2021 and analyzed the distribution of Sb, As, Cd, Cu, Pb, Cr, and Zn to identify their sources. The results revealed that the mean concentrations of heavy metals were above the background values, except for Cr and As. During the non-flood season, the midstream of Taipu River becomes a heavy metal hotspot, with their concentrations 2–5 times higher than those in upstream sediment. There were significant correlations (r = 0.79–0.99) among drainage, precipitation and flow rate, which indicated that drainage caused by both the opening of Taipu Gate and precipitation control the flow rate and, then, possibly influenced the distribution of heavy metals. Moreover, three sources (industrial sources, particle deposition sources, and natural sources) were characterized as the determinants for the accumulation of heavy metal by the Positive Matrix Factorization model, with the contribution rates of 41.7%, 32.9%, and 25.4%, respectively. It is recommended that the influence of hydrological conditions and industrial activities should be a key consideration when developing regulations for the management of heavy metals in rivers.

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“…Then, in stable situation, above dislodging percentages are equal [ 7 , 12 , 19 , 20 , 21 , 22 ]. Then, by associating Equations (1)–(6),

can be expressed as

.…”

Section: Methodsmentioning

confidence: 99%

“…Sheeting devices have not had extensive application in industry. The most important reason for this is the constancy or durability of sheeting, on account of the loss of carrier or sheeting dissolvant from the sheeting stage that has an impact on the selectivity of the sheeting and dislodging percentage of elements [ 12 , 17 , 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Diphasic Sheeting Device with Cyanex-301 for Dislodging Feature of Divalent Cadmium from Industrial Effluent

Pei

Wang

2022

IJERPH

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A novel diphasic sheeting device (DSD) including complemental feeding stage and complemental disintegrating stage for dislodging features of Cd(II), was investigated. The complemental feeding stage included feeding liquor and Bis(2,4,4 trimethylamyl) dithiophosphonic acid (Cyanex-301) as the carrier in petroleum, and the complemental disintegrating stage included Cyanex-301 as the carrier in petroleum and hydrochloric acid as the disintegrating reagent. The impacts of volumetric ratio of sheeting liquor and feeding liquor(S/F), initial molarity of Cd(II) and ion intensity of the feeding liquor, pH, volumetric ratio of sheeting liquor and disintegrating reagent (S/D), molarity of hydrochloric acid liquor, Cyanex-301 molarity in the complemental disintegrating stage on dislodging of Cd(II), the virtues of DSD compared to the traditional sheeting device, the constancy of system, the reuse of sheeting liquor, and the retention of the sheeting stage were also investigated. Experimental results illustrated that the optimum dislodging conditions of Cd(II) were achieved as hydrochloric acid molarity was 4.00 mol/L, Cyanex-301 molarity was 0.150 mol/L, and S/D was 1:1 in the complemental disintegrating stage, S/F was 1:10, and pH was 5.00 in the complemental feeding stage. The ion intensity of the complemental feeding stage had no distinct impact on the dislodging feature of Cd(II). When initial Cd(II) molarity was 3.20 × 10−4 mol/L, the Cd(II) dislodging percentage was up to 92.9% in 210 min. The dynamic formula was inferred on the basis of the theorem of mass transferring and the interfacial chemistry.

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Molybdenum background and pollution levels in the Taipu River, China

Cited by 14 publications

References 32 publications

Further Insight into Extractable (Organo)fluorine Mass Balance Analysis of Tap Water from Shanghai, China

Further Insight into Extractable (Organo)fluorine Mass Balance Analysis of Tap Water from Shanghai, China

Co-Effects of Hydrological Conditions and Industrial Activities on the Distribution of Heavy Metal Pollution in Taipu River, China

Diphasic Sheeting Device with Cyanex-301 for Dislodging Feature of Divalent Cadmium from Industrial Effluent

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