Algal Inhibiting Effects of Salicylic Acid Sustained-Release Microspheres on Algae in Different Growth Cycles

Ziqi Fan, Yingjun Wang, Chao Chen, Junrong Li, Yan He and Hong Xiao
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Ziqi Fan: College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
Yingjun Wang: College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
Chao Chen: College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
Junrong Li: College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
Yan He: College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
Hong Xiao: College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China

IJERPH, 2022, vol. 19, issue 10, 1-12

Abstract: Microcystis blooms and microcystins caused by eutrophication are harmful to the environment. At present, algicide based on allelochemicals is widely used in algae control. Environment-friendly sustained-release salicylate chitosan microspheres (SA-CS) were prepared by acylation of chitosan and glutaraldehyde. SA-CS was characterized by scanning electron microscopy, Fourier transform infrared spectral analysis, and laser particle sizer. The inhibitory effects of SA-CS on Microcystis aeruginosa at different stages, and the environmental impact of the inorganic index, were studied. The results showed that the mean size of SA-CS was 53.3 ?m, the encapsulation rate was 40.66%, and SA-CS had a good sustained-release effect (stable release within 25 days). On the seventh day, a 90% inhibition rate in the lag phase required 105 mg/L of SA-CS, whereas a 90% inhibition rate in the log phase required 675 mg/L of SA-CS. The sensitivity of Microcystis aeruginosa at the lag phase to salicylic acid was about 1.4 times that of the log phase, thus, it is recommended to control the algae in the lag phase. The long-term inhibition effect of SA-CS on algae was detected after adding sufficient SA-CS. In terms of salicylic acid, pH, and dissolved oxygen, no lousy effect was observed for the addition of SA-CS. SA-CS could effectively reduce the concentration of microcystin-LR by 50%. SA-CS is an environment-friendly sustained-release microsphere with good algal inhibition performance for Microcystis aeruginosa.

Keywords: microcystins; chitosan; microspheres; Microcystis aeruginosa; microcystin-LR (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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