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39 results on '"Chen, Guikui"'

23. The migration of cadmium and lead in soil columns and their bioaccumulation in a multi-species soil system

Author

Chen Guikui, Junhao Qin, Changhong Lai, Huashou Li, Jia Li, Zengguang Yan, and Dongqin Li

Subjects
Environmental Engineering, Health, Toxicology and Mutagenesis, 0208 environmental biotechnology, chemistry.chemical_element, Biomass, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, Soil, Animal science, Environmental Chemistry, Animals, Soil Pollutants, Oligochaeta, Triticum, 0105 earth and related environmental sciences, Cadmium, biology, Earthworm, Weight change, Public Health, Environmental and Occupational Health, Soil classification, General Medicine, General Chemistry, biology.organism_classification, Pollution, Bioaccumulation, 020801 environmental engineering, chemistry, Lead, Beijing, Soil horizon, Microcosm
Abstract

A soil microcosm experiment was carried out to quantify the transfer of cadmium (Cd) and lead (Pb) in a multi-species soil system (MS·3). Red earth from Jiangxi (S1), fluvo-aquic soil from Henan (S2), fluvo-aquic soil from Beijing (S3), and black soil from Heilongjiang (S4) were used for soil column packing with S1, S3, or S4 as the 20-50 cm layer and S2, which was Cd- and Pb-contaminated, as the top 0-20 cm layer. For each soil combination, four treatments were set up: CK (no wheat and no earthworm), W (only wheat), E (only earthworm), and E + W (earthworm and wheat). The results showed that the coexistence of earthworm with wheat reduced Cd and Pb contents in wheat plants and earthworms, and increased plant biomass, but had no significant effect on the survival rate and mean weight change rate of earthworms. Total Cd and Pb decreased remarkably in the 0-20 cm layer while increased in the 20-50 cm layer, and approximately 32.8%-51.1% of Cd and 0.35%-7.0% of Pb migrated down into the 20-50 cm soil layers from the 0-20 cm soil layers. The migration varied between the treatments from S2 to S1, S2, and S3. In S2-S1 and S2-S4 columns, the amount of Cd migration decreased when the earthworms coexisted with wheat, while in S2-S3 column, there was no significant difference on such amount regardless of the coexistence of earthworms with wheat. Taken together, the results indicated that the migration of Cd and Pb was not only associated with wheat and earthworm, but also depended on soil types.

Published
2020

31. Responses of two kidney bean ( Phaseolus vulgaris) cultivars to the combined stress of sulfur deficiency and cadmium toxicity.

Author

Li, Dongqin, Chen, Guikui, Lu, Qin, Li, Yongtao, Wang, Jinjin, and Li, Huashou

Abstract

Plants suffer from combined stress of sulfur deficiency and cadmium toxicity in some agricultural lands. However, little is known about the reaction in plants, such as responses in antioxidant enzymes and non-protein thiol compounds, to such combined stress. Therefore, in this study, four treatments, S-sufficiency (T), S-deficiency (T), Cd stress (T) and combined stress of S-deficiency and Cd stress (T), were set up to investigate (1) the effects of sulfur deficiency or sulfur sufficiency on Cd toxicity to kidney bean cultivar seedlings and the related mechanisms, and (2) the responses of two kidney bean cultivars to combined stress of S-deficiency and Cd-tolerance. The results showed significant increases in hydrogen peroxide (HO) and malondialdehyde contents and significant increases in antioxidant enzyme (superoxide dismutase, catalase, peroxidase, and glutathione S-transferase) activities and non-protein thiol compounds (non-protein thiols, reduced glutathione, phytochelatins) synthesis in the plants in T and T. On the tissue level, higher proportion of Cd was found to be immobilized/deposited in roots, while on the sub-cell level, higher proportion of Cd was located in cell walls and vacuole fractions with lower in cell organelles. Taken together, the results indicated that Cd detoxification was achieved by the two kidney bean cultivars through antioxidant enzyme activation, non-protein thiol compound synthesis and sub-cellular compartmentalization. In addition, the results indicated that sufficient S supply helped to relieve Cd toxicity, which is of special significance for remediation or utilization of Cd-contaminated soils as S is a plant essential nutrient. [ABSTRACT FROM AUTHOR]

Published
2018
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32. Acute toxicity of butachlor and atrazine to freshwater green alga Scenedesmus obliquus and cladoceran Daphnia carinata

Author

Jinbo He, Wenyang Li, Chen Guikui, Jing Yu, Huashou Li, and Hongzhi He

Subjects
Aquatic Organisms, China, Health, Toxicology and Mutagenesis, Fresh Water, Biology, chemistry.chemical_compound, Botany, Toxicity Tests, Acute, Animals, Atrazine, Herbicides, Public Health, Environmental and Occupational Health, General Medicine, Pollution, Acute toxicity, Joint action, chemistry, Daphnia, Daphnia carinata, Scenedesmus obliquus, Toxicity, Acetanilides, Antagonism, Butachlor, Water Pollutants, Chemical, Scenedesmus
Abstract

Both single and joint toxicity of atrazine and butachlor to freshwater green alga Scenedesmus obliquus and cladoceran Daphnia carinata isolated from South China were investigated in the present study. The 96 h-EC50 values of atrazine and butachlor to S. obliquus were 0.0147 and 2.31 mg L−1, while the 48 h-LC50 values to D. carinata were 60.6 and 3.40 mg L−1, respectively. These results suggest that atrazine could be highly toxic to S. obliquus and slightly toxic to D. carinata, while butachlor exhibits moderate toxicity to both organisms. The additive indexes of atrazine and butachlor mixtures were −2.68 (−3.02 to −2.32) to S. obliquus and 0.054 (−0.025 to 0.238) to D. carinata, respectively. Therefore, the joint action of two herbicides was significant antagonism to S. obliquus, while significant synergism was not shown to D. carinata. Moreover, significant linear correlation between the natural logarithm of herbicide concentrations and growth rates of alga S. obliquus was observed. Taken together, it is the first study reporting the toxicity endpoints for mixture of atrazine and butachlor against S. obliquus and D. carinata isolated from south China. The present results would be helpful to provide data to assess the ecological risk of both herbicides to aquatic organisms.

Published
2011

35. Efficient mitigation of arsenic accumulation in rice seedlings using in situformed hydrous titanium oxide from aqueous titanyl amendment

Author

Zhou, Juanjuan, Bi, Xiaoyang, Wu, Leshi, Li, Huashou, Qin, Junhao, Zhang, Zemin, Chen, Guikui, and Qiu, Rongliang

Abstract

The Arsenic (As) accumulation problem of plants has to be solved when exploring scattered As micro-polluted water as a new irrigation water source for food production. Herein, efficient As immobilization (1 mg-As/L) was realized by simply adding TiOSO4(TOS) solution in the irrigation water during rice seedling cultivation. The free soluble As in the rice culture was reduced by 99.4%. Most of the As was enriched in hydrous titanium oxide (HTO) formed from in situTOS hydrolysis (HTO-TOS), which possessed a very high specific surface area (347.6 m2/g) and the most abundant adsorption-active hydroxyl group. Adding TOS (100 mg/L) is tens of times better than adding TiO2nanoparticles and is even better than commercial HTO at a dosage up to 1000 mg/L in As-immobilization ability. On the one hand, TOS treatment transformed soluble As to insoluble forms by the strong complexation between freshly formed active HTO and As. On the other hand, a barrier of titanium and iron plaque was formed on root surface. Benefiting from these two aspects, the As contents in rice roots and shoots were reduced by 74.6% and 95.6%, respectively. The TOS treatment strategy had no adverse influence on rice growth while promoted the root growth by 39.4% and alleviated the oxidative stress of rice seedlings. Considering its simple application manner and good As control performance, TOS treatment has great potential on in situremediation of As-contaminated water and soil during cultivating diverse agricultural plants.

Published
2023
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39. [Distribution, migration and purifying effect of cadmium in artificial Avicennia marina wetland system].

Author

Chen G and Chen G

Subjects
Avicennia chemistry, Ecosystem, Water Purification, Avicennia physiology, Cadmium analysis, Sewage analysis, Soil Pollutants analysis
Abstract

An artificial mangrove Avicennia marina wetland was set up in a greenhouse, and an irrigation experiment with synthetic wastewater was performed to research the behavior of cadmium in the artificial wetland system. The synthetic wastewater C1 had the characteristics and strength similar to normal municipal sewage, while C5 and C10 had the nutrients and heavy metals as five and ten times as those in C1, respectively. The control was of 15 per thousand salinity. All the test wastewater was quantitatively irrigated weakly for a year. The results showed that the cadmium in the synthetic wastewater discharged into the system was mainly stagnated in soil subsystem (87.67%-96.74%), and only a small portion (0.43%-3.23%) migrated into plants and litters. After a year trial, the Cd content in roots was more than that in stems and leaves. The artificial Avicennia marina wetland system did have a significant effect on purifying cadmium in synthetic wastewater, and the purification rate for C1, C5 and C10 was 90.43%, 97.17% and 97.06%, respectively.

Published
2005

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