“…Durán–Álvarez et al proposed that the hysteresis of estrone and 17β-estradiol was primarily caused by the quantity of organic matter in the soil. The higher the content of organic matter in the soil is, the lower the desorption effect 30 . In addition to binding hysteresis, hysteresis is associated with fractions of soil that undergo structural hysteresis 31 .…”
Section: Resultsmentioning
confidence: 99%
“…For the synthetic estrogen EE 2 , K f increased with increased carbon concentration with the relationship K f = − 1.222 + 0.381 OC and R 2 = 0.922, but the trend of K f des was opposite to that of K f , where K f des = 46.382–4.371 OC, with R 2 = 0.999 31 . Durán-Álvarez et al found that irrigating soil with wastewater containing organic matter influenced the absorption of hormones in the soil 30 . Figure 3 Correlations between K f /K fdes and parameters of soil for QUN.…”
Quinestrol (QUN), a synthetic estrogen used as an oral contraceptive or emergency contraceptive component, has been shown to be an endocrine-disrupting chemical. To assess the environmental risk of QUN, batch equilibration experiments were conducted to investigate the adsorption–desorption of QUN in five contrasting soils from different areas of China. The leaching properties were also calculated based on the adsorption and degradation data from our previous study with the same soils. The Freundlich and Langmuir models were applied to the sorption–desorption data to examine the affinity towards QUN of the soils, which had varying physical and chemical properties. The K
f
and K
f
des
values of QUN in the tested soils ranged from 3.72 to 20.47 mg
1−n
L
n
kg
−1
and from 1.26 to 7.8 mg
1−n
L
n
kg
−1
, respectively, and
Q
m
ranged from 28.25 to 126.58 mg/kg. The desorption data showed that hysteresis occurred. The K
f
and K
f
des
values of QUN were positively correlated with the soil total organic carbon (OC) and cation exchange capacity (CEC), and it may be due to the content of TOC and CEC exhibited a positive correlation. A low mobility potential of QUN in soils was predicted and verified the adsorption results by the groundwater ubiquity score (GUS) and retardation factor (R
f
).
“…Durán–Álvarez et al proposed that the hysteresis of estrone and 17β-estradiol was primarily caused by the quantity of organic matter in the soil. The higher the content of organic matter in the soil is, the lower the desorption effect 30 . In addition to binding hysteresis, hysteresis is associated with fractions of soil that undergo structural hysteresis 31 .…”
Section: Resultsmentioning
confidence: 99%
“…For the synthetic estrogen EE 2 , K f increased with increased carbon concentration with the relationship K f = − 1.222 + 0.381 OC and R 2 = 0.922, but the trend of K f des was opposite to that of K f , where K f des = 46.382–4.371 OC, with R 2 = 0.999 31 . Durán-Álvarez et al found that irrigating soil with wastewater containing organic matter influenced the absorption of hormones in the soil 30 . Figure 3 Correlations between K f /K fdes and parameters of soil for QUN.…”
Quinestrol (QUN), a synthetic estrogen used as an oral contraceptive or emergency contraceptive component, has been shown to be an endocrine-disrupting chemical. To assess the environmental risk of QUN, batch equilibration experiments were conducted to investigate the adsorption–desorption of QUN in five contrasting soils from different areas of China. The leaching properties were also calculated based on the adsorption and degradation data from our previous study with the same soils. The Freundlich and Langmuir models were applied to the sorption–desorption data to examine the affinity towards QUN of the soils, which had varying physical and chemical properties. The K
f
and K
f
des
values of QUN in the tested soils ranged from 3.72 to 20.47 mg
1−n
L
n
kg
−1
and from 1.26 to 7.8 mg
1−n
L
n
kg
−1
, respectively, and
Q
m
ranged from 28.25 to 126.58 mg/kg. The desorption data showed that hysteresis occurred. The K
f
and K
f
des
values of QUN were positively correlated with the soil total organic carbon (OC) and cation exchange capacity (CEC), and it may be due to the content of TOC and CEC exhibited a positive correlation. A low mobility potential of QUN in soils was predicted and verified the adsorption results by the groundwater ubiquity score (GUS) and retardation factor (R
f
).
“…Generally, there is a lack of studies on the desorption of ibuprofen in soils. However, scarce studies documented that ibuprofen was mobile in soils with medium to high tendency for leaching to natural waters (Xu et al 2009b;Durán-Álvarez et al 2014) when more than 50% of the total sorbed drug was desorbed.…”
Section: Resultsmentioning
confidence: 99%
“…(1-1/n) ·l 1/n /kg (González-Naranjo et al 2013;Durán-Álvarez et al 2014;Estevez et al 2014) and with its moderate soil persistence under aerobic conditions (Xu et al 2009a), which may be prolonged under anaerobic conditions (Lin & Gan 2011). Ibuprofen sorption in soils is correlated positively with organic carbon content (Xu et al 2009a;Estevez et al 2014) and clay content (González-Naranjo et al 2013).…”
Hiller E., Šebesta M. (2017): Effect of temperature and soil pH on the sorption of ibuprofen in agricultural soil. Soil & Water Res., 12: 78−85.Besides many natural factors, soil pH and temperature can have significant effects on the sorption of pharmaceuticals in soils. This is the first study, which aimed to evaluate the effect of soil pH and temperature on the sorption of ibuprofen in soil. Sorption-desorption experiments at 20°C indicated weak retention of ibuprofen in the soil. Sorption of ibuprofen in the soil was affected by both temperature and pH with the latter showing much greater effect. The extent of ibuprofen sorption increased with decreasing pH mainly due to the change of ibuprofen speciation from negatively charged ions at high pH to the neutral form at low pH. At pH 4, the distribution coefficient K d was 1.30 l/kg, whereas at pH 8, it was only 0.42 l/kg. When temperature increased, the sorption of ibuprofen decreased, showing that its sorption was exothermic.
“…Sorption reversibility of a sex hormone can be determined via both quantitative and qualitative ways. Specifically, the overlap between sorption and desorption isotherms of a sex hormone is considered as reversible sorption, while the lack of overlap indicates irreversible sorption (Durán-Álvarez et al, 2014;Qu et al, 2014). The irreversible sorption can also be evidenced by nearly identical solid phase concentrations of a sex hormone after sorption and desorption equilibration (Qu et al, 2014;Yang et al, 2020a).…”
Sex hormones are a group of potent endocrine disruptors that can be released into agricultural soils and sediment via wastewater discharge and manure fertilization. Sorption represents a critical determinant for the transport potential and risks of sex hormones in the environment. Therefore, this study reviewed the sorption and desorption mechanisms of sex hormones in soil-and sedimentwater systems, and summarized the effects of various factors on sorption and desorption processes. A total of 359 set of sorption data were collected from the literature. Sex hormones were mostly described by the linear model. The sorption magnitudes (logK oc ) of estrogens, androgens, and progestins were in the range of 2.77-3.90, 2.55-4.18, and 2.61-4.39, respectively. The average logK oc values of the sex hormones were significantly correlated with their logK ow values (R 2 = 0.13, p < 0.05), while the R 2 values were much lower than those when fewer sex hormones were included for analysis. In addition, the K d values of most sex hormones were significantly correlated with the OC% of soils and sediment (R 2 = 0.16 -0.99, p < 0.05), but were insignificantly correlated with the particle size distribution and surface area. These results indicated that hydrophobic partitioning interaction and other specific interactions are responsible for sex hormone uptake in soil-and sediment-water systems. The sorption of sex hormones in soil-and sediment-water systems can also be affected by other environmental variables, including pH, temperature, and ionic strength. Future studies should focus on the coupled leaching-sorption processes in manure-water-soil systems under field-scale conditions.
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