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工矿企业产生的铬渣、含铬废水由于管理不善导致土壤铬污染严重,迫切需要寻求低成本铬污染土壤修复技术。提出腐解稻草中溶解性有机质(Dissolved Organic Matter, DOM)提取液洗脱铬污染土壤的技术,通过实验室模拟试验,以2种铬污染土壤(总铬含量为分别为121.54、941.90 mg/kg,六价铬含量分别为119.90、856.90 mg/kg)为研究目标,采用振荡淋洗法考察了固液比、淋洗时间、淋洗次数等因素对土壤中总铬、六价铬洗脱效果的影响,并探讨了淋洗前后铬形态变化及淋洗后土壤残留六价铬的持续钝化能力。研究结果表明:稻草经35 d腐解后的DOM提取液洗脱土壤中铬效果最佳,确定为最佳淋洗剂;固液比1:15、淋洗4h/次、淋洗2次为最佳淋洗工艺条件,该条件下,2种铬污染土壤总铬分别洗脱了47.79%、85.92%,六价铬含量分别削减了51.76%、95.09%;DOM提取液呈弱碱性,包含大量羧基、羟基及酚类物质,对水溶态、弱酸提取态和残渣态铬有较好的洗脱效果,有效降低了土壤环境风险,且能持续钝化淋洗后土壤中残余的六价铬。 相似文献
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Brett J. Kagan Charlotte M. Ermine Stefano Frausin Clare L. Parish Jess Nithianantharajah Lachlan H. Thompson 《International journal of molecular sciences》2021,22(9)
Neonatal arterial ischemic stroke is one of the more severe birth complications. The injury can result in extensive neurological damage and is robustly associated with later diagnoses of cerebral palsy (CP). An important part of efforts to develop new therapies include the on-going refinement and understanding of animal models that capture relevant clinical features of neonatal brain injury leading to CP. The potent vasoconstrictor peptide, Endothelin-1 (ET-1), has previously been utilised in animal models to reduce local blood flow to levels that mimic ischemic stroke. Our previous work in this area has shown that it is an effective and technically simple approach for modelling ischemic injury at very early neonatal ages, resulting in stable deficits in motor function. Here, we aimed to extend this model to also examine the impact on cognitive function. We show that focal delivery of ET-1 to the cortex of Sprague Dawley rats on postnatal day 0 (P0) resulted in impaired learning in a touchscreen-based test of visual discrimination and correlated with important clinical features of CP including damage to large white matter structures. 相似文献
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一种新的位错运动理论及对材料动态力学行为的描述 总被引:3,自引:0,他引:3
通过对位错在晶格内运动的动力学过程的全面分析。本文提出了一种考虑到粘性阻尼效应和热激活的位错集体运动统一理论。其特点是可用一简单的方程对从低速到高速运动的大量位错的平均行为进行统一描述。对KCl晶体的典型实验怕拟合发现理论描述与实验结果相当一致。 相似文献
35.
The relations between coke yields and the volatile matter content of 30 individual and 30 blended coals were investigated. Coke yields and deposited carbon related to volatile matter content can be expressed in the following equations: CY (%) = 97.89?0.86 VMch+VMc; and DC (%)= ?2.24+0.16 VMch; where: CY=real coke yield; VMch = volatile matter content of charging coal; VMc=volatile matter content of coke, and in the case of <2%; DC = deposited carbon. The test results show excellent correlation with practice. 相似文献
36.
The mineralogy of clay-rich mineral matter isolated from a range of Australian bituminous coals has been evaluated in quantitative terms from X-ray powder diffraction (XRD) patterns using a Rietveld-based data processing technique. The chemical composition of coal ash derived from this mineral matter has been calculated and compared to the directly determined composition of the ash prepared from the same coal samples. Although there are some minor differences due in part to uncertainty regarding the actual composition of several minerals, the compositions indicated by the two methods show a relatively high correlation, suggesting that the Rietveld technique provides mineralogical analyses that are consistent with independently determined chemical data. Comparison of the normalised clay mineral percentages from the Rietveld analysis to quantitative interpretations based on a peak intensities in glycolated and heat-treated oriented aggregates of the respective clay fractions also shows a high correlation, confirming mutual consistency of the two different mineralogical analysis methods. Such quantitative mineralogical data are significant to a range of coal exploration, mining and utilization activities, including seam correlation, material handling and ash and slag formation in combustion processes. 相似文献
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The influence of Ca(OH)2 on K and Mg exchange equilibria in three New Zealand soils was studied. Calcium hydroxide was mixed with each soil to raise the pH to about 6 or 7. For each Ca(OH)2 treatment, K and Mg exchange isotherms were determined, from which the equilibrium activity ratios were derived. Exchange coefficients and solution activity ratios were calculated according to the Gapon convention.The addition of Ca(OH)2 produced varying effects in the Gapon exchange coefficient for both K and Mg. The magnitude and direction of change in the exchange coefficient were related to the cation initially dominating the exchange sites, rate of Ca(OH)2 addition, soil colloids contributing to the CEC and specific interactions of Ca with these soil colloids.Addition of Ca(OH)2 reduced the equilibrium activity ratio of all soils. Changes in the bonding strength of K and Mg with increasing CEC were suggested as a possible mechanism for this decrease. 相似文献
40.
气相色谱法测定饲料香味剂中香味成分的含量 总被引:2,自引:0,他引:2
用气相色谱氢火焰离子化检测器,SE-52毛细管柱对四甲苯做内标,分别饲料香味剂中NB-68200香精液组分的含量,分离效果好。 相似文献