云南云县果园铜矿床地质特征、找矿标志及找矿潜力分析

果园铜矿位于云县-景谷-景洪Cu、Sn多金属成矿带,澜沧江火山弧与兰坪-思茅弧后盆地的过渡地带.矿带内已发现一处大型(思茅大平掌)、多处中小型(景洪三达山、景东文玉、景谷民乐、岔河、云县铜厂沟、查家村等)火山热液型铜矿床.矿区成矿条件优越,含矿地层为上三叠统小定西组(T3xd).含矿岩性为安山岩、玄武岩、安山玄武岩.矿体在空间上受控于北西向、北东向断裂构造破碎带.本文总结其成矿地质特征,找矿标志,对矿区找矿潜力进行分析,认为本矿区及外围工作程度较低,通过进一步工作,具有找到中-大型铜矿床的远景规模.     

浙江青田县万山萤石矿矿床地质特征及成因

浙江青田县万山萤石矿成矿作用主要由地热水浅循环伴含氟成矿流体,在特定的物理化学条件下,沿有利的构造空间富集成矿,属低温热液充填型脉状矿床.矿体矿石、矿物组分比较简单,矿石矿物为萤石,脉石矿物以石英为主,次为蛋白石、高岭石、黄铁矿、方解石、绿泥石等.矿石主要化学成分为CaF2和SiO2,矿石中SiO2、CaF2二者总量约占97％～99％.随着CaF2含量的增加,SiO2含量减少.     

Ultrasound‐Assisted Emulsification–Microextraction Combined with Graphite Furnace Atomic Absorption Spectrometry for the Determination of Trace Lead in Water

The ultrasound‐assisted emulsification–microextraction (USAEME) method was combined with graphite furnace atomic absorption spectrometry (GFAAS) for the determination of trace Pb using dithizone (H²DZ) as chelating reagent. Some effective parameters influenced the detection and microextraction, such as ashing temperature and atomization temperature, pH, extraction solvent, sample volume, extraction time, and extraction temperature were selected and optimized. After extraction, the calibration curves for Pb was in the concentration range of 0.1–10 ng mL^?1, and the linear equation was y = 0.097 x + 0.023 (R = 0.99). Under the optimized conditions, the detection limit of the method was 20 pg mL^?1 with an enrichment factor of 70 and the relative standards deviation (RSD) for seven determinations of 1 ng mL^?1 Pb was 11%. The proposed method was successfully applied to determine trace Pb in Yueya Lake water, pond water, and spiked samples. Furthermore, a certified reference material of Environment Water (GBW08607) was analyzed and the determined value was in good agreement with the certified value, which showed the accuracy, recovery, and applicability of the reported method.     

Biodegradation of Herbicide Propanil and Its Subproduct 3,4‐Dichloroaniline in Water

The rational use of pesticides generates an impact which is normally reversed and eliminated by the environment itself. However, the indiscriminate use of pesticides makes its natural degradation rhythm difficult, prolonging their presence in the soil for a great deal of time. Aiming towards a decrease in the environmental impact of pesticides, soil microorganisms capable of degrading pesticides, such as propanil, were investigated. An Enterobacter cloacae strain, isolated from rice field soil, was exposed to the herbicide propanil alone and in a mixture containing also bentazone, clomazone, quinclorac, and 2,4‐D. This bacterium was able to eliminate 100% of the applied propanil in 28 days. Propanil degradation in the 5‐herbicide mixture was much lower than that of individual pesticide degradation. The aeration of the system helped to degrade propanil and its subproduct 3,4‐dichloroaniline much faster. LC with UV detection was used to determine the remaining concentrations of the herbicides and their subproducts.     

Water quality monitoring in the Paul do Boquilobo Biosphere Reserve

The Paul do Boquilobo is an important wetland ecosystem classified by Unesco as a MAB Biosphere reserve also awarded Ramsar site status, representing one of the most important habitats for the resident nesting colony of Cattle Egret (Bulbucus ibis). Yet owing to its location, it suffers from human induced impacts which include industrial and domestic effluent discharges as well as agricultural land use which have negatively impacted water quality. The current study reports the results obtained from the introductory monitoring programme of surface water quality in the Nature Reserve to emphasize the detrimental impact of the anthropogenic activities in the water quality of such an important ecosystem. The study involved physicochemical and biotic variables, microbial parameters and biological indicators. Results after 3 years of monitoring bring to evidence a poor water quality further impaired by seasonal patterns. Statistical analysis of data attributed water quality variation to 3 main parameters – pH, dissolved oxygen and nitrates, indicating heavy contamination loads from both organic and agricultural sources. Seasonality plays a role in water flow and climatic conditions, where sampling sites presented variable water quality data, suggesting a depurative function of the wetland.     

陕西彬县地区湿陷性黄土纵向分布特征及湿陷性计算

通过对陕西彬县地区黄土进行物性指标及湿陷性试验,探讨了该地区物理性质指标及湿陷性的纵向分布规律,根据分布特征结合数理统计的方法对湿陷性的关键因素进行研究,拟合其相应经验公式,进一步总结出该地区黄土的一些特征,对该地区黄土的研究及工程勘察设计提供参考依据。     

高公岛近岸海域浮游植物群落特征

2009年8月对高公岛附近海域的海洋浮游植物及环境因子进行了调查,在14个调查站位共鉴定浮游植物4门36属81种,其中,硅藻门25属63种,占种数的77.78%;甲藻门9属16种,占种数的19.75%,蓝藻门1属1种,占种数的1.23%,金藻门1属1种,占种数的1.23%。浮游植物生态类型主要以低盐近岸性类群为主,辅以少量的广温广盐性类群。主要优势种为斯氏几内亚藻、短角弯角藻、拟旋链角刺藻、扭链角刺藻。优势度分别为0.688、0.207、0.142、0.103。浮游植物的细胞丰度范围为0.458×105～3.134×105个/L,平均值为1.180×105个/L。群落特征指数变幅较大(种类数为19～43,丰富度指数为1.064～2.364,多样性指数为2.069～3.428,均匀度指数为0.485～0.677)。丰富度指数均值为1.753多样性指数均值为2.926,均匀度指数均值为0.592。相关性分析表明,仅均匀度指数与水温之间具有显著的相关性,相关系数(r)为0.544,P<0.05,水温越高,均匀度指数越高;其它因子之间均没有显著的相关性。高公岛近岸海域水质状况的生物多样性指数评价显示,该海域水质总体处于轻污染,尚适宜浮游植物的生长。