Yang Yonghao,Luo Zhihao,Wei Zuoan,Zhao Junkang,Lu Ting,Fu Tianbao,Tang Shuang
Tailings dust can negatively affect the surrounding environment and communities because the tailings are vulnerable to wind erosion. In this study, the effects of halides (sodium chloride [NaCl], calcium chloride [CaCl 2 ], and magnesium chloride hexahydrate [MgCl 2 ·6H 2 O]), and polymer materials (polyacrylamide [PAM], polyvinyl alcohol [PVA], and calcium lignosulfonate [LS]) were investigated for the stabilization of tailings for dust control. Erect milkvetch ( Astragalus adsurgens ), ryegrass ( Lolium perenne L.), and Bermuda grass ( Cynodon dactylon ) were planted in the tailings and sprayed with chemical dust suppressants. The growth status of the plants and their effects on the mechanical properties of tailings were also studied. The results show that the weight loss of tailings was stabilized by halides and polymers, and decreased with increasing concentration and spraying amount of the solutions. The penetration resistance of tailings stabilized by halides and polymers increased with increasing concentration and spraying amount of the solutions. Among the halides and polymers tested, the use of CaCl 2 and PAM resulted in the best control of tailings dust, respectively. CaCl 2 solution reduces the adaptability of plants and therefore makes it difficult for grass seeds to germinate normally. PAM solutions are beneficial for the development of herbaceous plants. Among the three herbaceous species, ryegrass exhibited the best degree of development and was more suitable for growth in the tailings. The ryegrass plants planted in the tailings sprayed with PAM grew the best, and the root-soil complex that formed increased the shear strength of the tailings.
Water scarcity is an important limiting factor for human life and agricultural production in arid regions. Atmospheric water harvesting (AWH) technology, which captures moisture from the surrounding air, demonstrates significant potential for clean water production and soil irrigation. In this research, marine polysaccharide-lignosulfonate hollow hygroscopic microbeads were prepared for incorporating salts (LiCl or CaCl 2 ), generating the lithium chloride/sodium alginate/calcium lignosulfonate/carbon nanotubes (LiCl/SA/CaLS/CNTs) and the calcium chloride/sodium alginate/calcium lignosulfonate (CaCl 2 /SA/CaLS) biopolymer microbeads that effectively harvest moisture. The LiCl/SA/CaLS/CNTs microbeads show a high water uptake value of 11.7 g/g at 90% relative humidity (RH) and rapid adsorption-desorption. More than 99.9% of the adsorbed water could be rapidly released in only 2.5 hours at the solar intensity of 2.0 kW/m 2 in the natural environment. Modification of soil with the CaCl 2 /SA/CaLS microbeads significantly prolonged ryegrass survival for 13 days (compared to the blank control) by atmospheric water irrigation at 26°C and 60% RH. The all-natural composite material is also eco-friendly and non-toxic, promising a feasible and effective sustainable solution to clean water production in water-deficient areas and agricultural irrigation in seasonally arid areas.
Min Xie,Jun Xu,Dan Fei,Ye-Lan Guang,Yao-Min Zhou,Fan Li,Li-Zhen Hu
An improved QuEChERS method combined with Multi-Plug Filtration Cleanup (m-PFC) clean-up procedure was developed for the simultaneous determination of 16 different sulfonamides in forage grasses using ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS). The forage grass sample was extracted with 0.1 mol L−1 Na2EDTA-Mcllvaine buffer and acetonitrile solution, purified by the Navo U-QuE column tube, separated by Agilent ZORBAX Eclipse Plus C18 column, and analyzed by MRM (multiple reaction monitoring) mode and the internal standard method was utilized for quantification. The 16 different sulfonamides display good linearity within the range of 0.5–50 μg L−1 (R2 > 0.9967), the limit of detection was 0.02–0.5 μg kg−1, and the limit of quantification was 0.05–1.0 μg kg−1. Under the additive amounts of 1, 2, and 10 μg kg−1, the recoveries were in the range of 72.3–116.9%, and the relative standard deviation was between 1.4% and 10.3%. The presented method showed the advantages of simple operation, excellent selectivity and high sensitivity. It was well-suited for both qualitative and quantitative analyses of sulfonamides in forage grass. Overall, this method provided a scientific basis for risk assessment, enforcement of quality and safety standards, and detection of sulfonamide residues in forage grass for import and export.
危险品化学品经营许可证（带存储）