Effect of gastric fluid on adsorption and desorption of endocrine disrupting chemicals on microplastics

doi:10.1007/s11783-022-1525-8

Front. Environ. Sci. Eng.

2022, Vol. 16

Issue (8) : 104 https://doi.org/10.1007/s11783-022-1525-8

RESEARCH ARTICLE

Effect of gastric fluid on adsorption and desorption of endocrine disrupting chemicals on microplastics

Jie Wu^1,², Jian Lu^1,^2,⁴(

), Jun Wu³

¹. CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS); Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, China
². University of Chinese Academy of Sciences, Beijing 100049, China
³. Yantai Research Institute, Harbin Engineering University, Yantai 264006, China
⁴. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China

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Abstract

• Effect of gastric fluid on EDCs adsorption-desorption to microplastics was evaluated.

• The gastric fluid enhanced desorption of EDCs on the surface of microplastics.

• Adsorption and desorption isotherms fitted the Freundlich model well.

• Desorption ratios of EE2 (55%–59%) on PVC were larger than that of E2 (49%–55%).

• Decrease in pH and increase in ionic strength in gastric fluid strengthen desorption.

Microplastics and endocrine disrupting chemicals are emerging pollutants in the marine environment because of their potential hazards. The effect of gastric fluid on the adsorption and desorption of 17β-estradiol (E2) and 17α-ethynylestradiol (EE2) to microplastics was investigated. The adsorption and desorption isotherms of E2/EE2 on microplastics could be well fitted by the Freundlich model while the Gibbs free energy of these processes were negative, proving that the reaction occurred spontaneously on the heterogeneous surface of the microplastics. Desorption ratios of EE2 (55%–59%) on PVC were larger than that of E2 (49%–55%) to indicate that EE2 was less stable in gastric fluid, which could be explained by the fact that the hydrophobicity of EE2 was greater than E2. E2/EE2 were more easily desorbed from PVC in the gastric fluid and the desorption amount (5.25–12.91/7.19–17.86 μg/g) increased by 2.51 times in comparison with that in saline solution (2.22–7.81/2.87–10.80 μg/g). The decrease of pH and the increase of ionic strength in gastric fluid could further strengthen desorption of E2/EE2 from PVC. The promotion of gastric juice on desorption of PVC was achieved by reducing the hydrophobicity of the PVC surface. The desorption rate of E2/EE2 at 18°C and 38°C was respectively 44%–47%/46%–50% and 49%–55%/56%–59%, indicating that PVC loaded with E2/EE2 had a relatively greater risk of releasing pollutants in the gastric fluid of constant temperature marine organisms while higher temperatures exposed higher hazards for variable temperature animals. The interaction between microplastics and pollutants might be mainly hydrophobic interaction.

Keywords Microplastics Gastric fluid Endocrine-disrupting chemicals Adsorption Desorption

Corresponding Author(s): Jian Lu

About author:

Tongcan Cui and Yizhe Hou contributed equally to this work.

Issue Date: 21 December 2021

Cite this article:

Jie Wu,Jian Lu,Jun Wu. Effect of gastric fluid on adsorption and desorption of endocrine disrupting chemicals on microplastics[J]. Front. Environ. Sci. Eng., 2022, 16(8): 104.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-022-1525-8
https://academic.hep.com.cn/fese/EN/Y2022/V16/I8/104

Fig.1 The adsorption kinetics of E2 (a, c, e) and EE2 (b, d, f) on microplastics in seawater with salinity of 15‰ (a, b), 25‰ (c, d) and 35‰ (e, f), respectively, fitted by pseudo-first-order and pseudo-second-order kinetic model.

Fig.2 The desorption kinetics of E2 and EE2 on microplastics in simulated gastric fluid, respectively, fitted by pseudo-first-order and pseudo-second-order kinetic model. (a–f) in the desorption process respectively corresponded to (a–f) in the adsorption process in Fig. 1.

Fig.3 Comparison of E2 (a, c, e) and EE2 (b, d, f) desorption from PVC in three desorption solutions. (a) and (b), (c) and (d), (e) and (f) respectively represented the initial concentration of pollutants with 200, 500, 1000 μg/L in the adsorption solution. The desorption kinetics was fitted by first-order two-compartment kinetics.

Fig.4 Desorption behavior of E2 (a, c) and EE2 (b, d) in gastric fluid with different pH (a, b) and ionic strength (c, d).

Fig.5 The influence of external temperature on the release of E2 (a, c, e) and EE2 (b, d, f) on microplastics. (a) and (b), (c) and (d), (e) and (f) respectively represented the initial concentration of pollutants with 200, 500, 1000 μg/L in the adsorption solution. Desorption kinetics was fitted by first-order two-compartment kinetics.

Fig.6 The adsorption and desorption thermodynamic isotherms of E2 (a) and EE2 (b) fitted by Freundlich model.

Tab.1 Parameters of Freundlich adsorption and desorption of E2/EE2 on PVC in three desorption solutions

Fig.7 The changes of microplastics samples treated in different solutions were observed by Fourier transform infrared spectroscopy and a water contact angle (MP_a: seawater with the salinity of 35‰, MP_b: seawater with the salinity of 25‰, MP_c: seawater with the salinity of 15‰, MP_d: simulated gastric fluid with 200 mM NaCl, MP_e: simulated gastric fluid with 100 mM NaCl, MP_f: simulated gastric fluid with 10 mM NaCl, MP_g: simulated gastric fluid at pH of 7, MP_h: simulated gastric fluid at pH of 4, MP_i: simulated gastric fluid at pH of 2).

Fig.8 The influence of gastric fluid on the desorption of endocrine disrupting chemicals on microplastics.

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