福建山地龙眼园土壤镁素状况与龙眼缺镁调控措施

福建山地龙眼园土壤镁素状况因成土母质不同而异，玄武岩发育的土壤供镁充足，第四纪红壤尤其是花岗岩、凝灰岩发育的土壤供镁水平低或极低，这类土壤是福建山地龙眼园的主要土壤类型，应重视旋用镁肥。土壤活性铝含量高，部分龙眼园土壤K／Mg比值过高，抑制了龙眼镁素吸收，也是造成山地龙眼缺镁的重要原因。龙眼缺镁的调控措施是：施用镁肥（硝酸镁喷施结合土施钙镁磷肥）；合理配施钾肥和镁肥；消除铝毒。     

青海昆特依和马海盐湖区钾镁盐矿床固体矿的基本特征

该文根据相关研究资料，详细探讨了青海昆特位和马海盐湖区钾镁盐矿床固体矿的成因、物质成份、矿床的规模以及矿床的沉积特征，并且对两地区固体矿形成模式作了研究。     

水合碱式硫酸镁晶须的物理化学性能表征

研究了碱式硫酸镁品须的微观形态、化学组成、溶解性、比重等物理化学性质。通过X-射线衍射光谱和红外吸收光谱研究了其结构特性。     

野外现场多元素快速分析方法的研究和应用Ⅲ．磷钙镁的微珠比色测定

介绍了微珠比色测定磷、钙、镁的野外现场快速分析方法。微珠比色法测磷是在磷钼蓝分光光度法的基础上改进而成的，减少了测定的取样量，检出限降至1ng，磷的检测范围为1—1000ng，标准加入回收率为95％—105％，RSD为3．2％。微珠比色法测钙采用乙二醛缩-双(2-羟基苯胺)为显色剂，在碱性条件下，生成红色配合物，以辛醇为提取剂形成微珠，可测至20ng的钙，该方法快速简单，但稳定时间不长。镁与二甲苯胺蓝Ⅱ形成的蓝色配合物可被辛醇提取，富集于微珠中进行目视比色测定，干扰元素采用掩蔽剂消除，可测定低至20ng的镁。     

海洋资源的化学XX盐化工废弃物高低温盐有效利用的研究

报道利用盐化工废弃物高低温盐制取无机阻燃剂氢氧化镁和具有广泛用途的氟硅酸钠的几种新方法。本文采用沉淀法，使高低温盐中的Ｍｇ２＋、Ｎａ＋得以有效的利用，其利用率可达１００％     

镁同位素示踪白云石化流体迁移路径——以四川盆地石炭系黄龙组为例

镁(Mg)是组成白云石的核心元素,直接参与了白云石化过程,因此白云岩Mg同位素能够用于示踪白云岩成因和白云石化流体迁移路径。四川盆地东部上石炭统黄龙组白云岩发育,也是重要储集层。通过对黄龙组连续取芯的七里53井开展详细的沉积学研究,系统选取样品开展元素地球化学和Mg同位素分析,发现Mg同位素波动变化与沉积旋回存在密切关联,旋回边界为白云石化流体迁移界面,即白云石化流体迁移通道;依据Mg同位素值垂向演化规律,识别出黄龙组白云岩5个流体交换界面通道,逐层白云石化。因此,厚层白云岩是由若干个薄层灰岩层逐层白云石化叠加而成。这一发现为预测白云岩成因及储层分布提供了重要理论依据。     

Magnesium Isotopic Compositions of International Geological Reference Materials

Magnesium isotopic compositions are reported for twenty‐four international geological reference materials including igneous, metamorphic and sedimentary rocks, as well as phlogopite and serpentine minerals. The long‐term reproducibility of Mg isotopic determination, based on 4‐year analyses of olivine and seawater samples, was ≤ 0.07‰ (2s) for δ²⁶Mg and ≤ 0.05‰ (2s) for δ²⁵Mg. Accuracy was tested by analysis of synthetic reference materials down to the quoted long‐term reproducibility. This comprehensive dataset, plus seawater data produced in the same laboratory, serves as a reference for quality assurance and inter‐laboratory comparison of high‐precision Mg isotopic data.     

白云石循环法生产氧化镁新工艺的研究

介绍了用循环法从白云石中制取氧化镁的新工艺,制得的工业氧化镁达到了ＨＧ／Ｔ２５７３－９４的质量要求。     

Glacial–interglacial changes in Subantarctic sea surface temperature and δO-water using foraminiferal Mg

Laboratory culturing experiments with living Globigerina bulloides indicate that Mg/Ca is primarily a function of seawater temperature and suggest that Mg/Ca of fossil specimens is an effective paleotemperature proxy. Using culturing results and a core-top Neogloboquadrina pachyderma calibration, we have estimated glacial–interglacial changes in sea surface temperature (SST) using planktonic Mg/Ca records from core RC11-120 in the Subantarctic Indian Ocean (43°S, 80°E) and core E11-2 in the Subantarctic Pacific Ocean (56°S, 115°W). Our results suggest that glacial SST was about 4°C cooler in the Subantarctic Indian Ocean and 2.5°C cooler in the Subantarctic Pacific. Comparison of SST and planktonic δ¹⁸O records indicates that changes in SST lead changes in δ¹⁸O by on average 1–3 kyr. The glacial–interglacial temperature change indicated by the Subantarctic Mg/Ca records suggests that temperature accounts for 40–60% of the foraminiferal δ¹⁸O change. We have used the Mg/Ca-based SST estimates and δ¹⁸O determinations to generate site-specific seawater δ¹⁸O records, which suggest that seawater δ¹⁸O was on average 1‰ more positive during glacial episodes compared with interglacial episodes.     

Geochemical and environmental factors controlling exposure to cerium and magnesium in Uganda

The presence of elevated levels of dietary Ce and deficient levels of dietary Mg in southern India have been assigned as potential environmental cofactors in the aetiology of endomyocardial fibrosis. However, environmental exposure to Ce in tropical environments, where EMF is prevalent, is poorly understood because of wide variation in geochemical environments and local dietary habits. This paper describes collaborative studies based in Uganda to define environmental exposure pathways within a region where EMF is endemic, and represents the most common form of infantile heart condition. Data are presented from a survey of major foodstuffs, soils and waters which indicate that the most probable pathway for Ce exposure is from dust and inadvertent carriage of soil. In addition to substantiating observations made in southwestern India, detailed studies of Ugandan soils, dusts and waters indicate that Ce within the Ugandan environment is controlled by the presence of sub-20 μm particles in the soil. These are probably present as secondary rare earth minerals rather than monazite as assumed by workers in India.