Sulfur Mass Fractions in Thirty-Seven Geological Reference Materials by Titration,XRF and Elemental Analyser     

Olivier Alard  Ananuer Halimulati  Lauren Gorojovsky  Peter Wieland 《Geostandards and Geoanalytical Research》2023,47(2):437-456

Although sulfur is a relatively abundant element, measurement results with small uncertainties remain challenging to achieve, especially at S mass fractions below 100 μg g^-1. We report > 1700 measurement results of S for thirty-seven geological reference materials including igneous, metamorphic and sedimentary rocks, and one soil. Measurement results were obtained in two laboratories (Macquarie GeoAnalytical and Géosciences Montpellier) over a long period of time ≈ 25 years (1997–2022), using several measurement procedures: X-ray fluorescence, high temperature iodo titration and elemental analysers equipped with thermal conductivity and/or infra-red detectors. Sulfur mass fractions for these diverse geological reference materials range between 5.5 and 11,395 μg g^-1. While the comprehensive data set reported here should contribute significantly to a better characterisation of the S mass fractions of widely used geological reference materials, computed uncertainties, data distribution and comparison to published values still indicate heterogeneous distribution of S carrier(s) and analytical bias.  相似文献   

88ka以来冲绳海槽北部古环境演化:来自元素地球化学的证据   总被引：1，自引：1，他引：0  

朱爱美  石学法  邹建军  张辉  吴永华  刘焱光 《海洋学报》2015,37(6):58-69

对CSH1岩心全样沉积物样品进行元素地球化学分析,揭示了过去88ka冲绳海槽北部沉积物成分、水动力条件及陆源碎屑物质源区风化历史。冲绳海槽北部碎屑沉积物母岩主要以长英质为主,在MIS 1期沉积物存在大量火山源物质。过去88ka,沉积物源区风化程度较弱,但是自冰消期以来有逐渐增强的趋势。沉积物Zr/Nb比值表明在MIS 1期和MIS 5.1期水动力较为强烈,这与黑潮增强的时间一致,可能是指示黑潮强度的一个指标。冲绳海槽北部陆坡沉积物陆源碎屑贡献在低海平面时期显著增加,而在MIS 1和MIS 5.1期生源贡献显著增加。冲绳海槽北部沉积物成分变化明显受到黑潮和入海径流的调节,实际上受海平面和东亚季风的制约。  相似文献   

大叶藻的热值和元素含量(碳、氮、磷)及其相关性 _*     

杨贵福  邢坤  李耕  刘海映  潘玉洲  张力 《海洋与湖沼》2015,46(1)

提要:选取辽宁獐子岛近岸海域大叶藻样品,对其根系、根状茎和不同生长阶段叶片的灰分含量、热值和元素含量(碳、氮、磷)及其相关性进行研究,结果表明：在不同生长阶段,叶片长度随着生长顺序先增大后减小;灰分含量随着叶片生长逐渐升高,且极显著小于根状茎和根系(P<0.01);不同部位干质量热值差异极显著(P<0.01),以初生叶最高,为14894.36±40.25 Jg-1,后逐渐减小,在根系中最小,为8153.81±78.91 Jg-1;不同生长阶段叶片的去灰分热值差异不大,但大于根系和根状茎;碳氮磷含量均呈同一趋势：初生叶>幼叶>成熟叶1>成熟叶2>衰老叶>根状茎>根系;N/P比值为12.23,说明大叶藻存在N限制;N/P比值在根状茎中最大,根系中最小,这说明大叶藻存在能量的转移和存贮;大叶藻不同部位灰分含量与干质量热值、去灰分热值、碳含量、氮含量、磷含量之间呈极显著的负相关(P<0.01),干质量热值与碳含量、氮含量、磷含量之间呈极显著的正相关(P<0.01);大叶藻不同部位的热值与碳氮磷元素含量之间均呈显著的线性关系(P<0.05)。  相似文献   

响应面法优化鱿鱼(Ommastrephes bartrami)皮胶原蛋白提取液脱色工艺   总被引：2，自引：1，他引：1  

张雪  令狐青青  童晓倩  毛贵珠  罗红宇  宋茹 《海洋与湖沼》2015,46(1):221-227

采用活性炭吸附法脱除鱿鱼(Ommastrephes bartrami)皮胶原蛋白提取液中色素,优化脱色条件,以进一步利用鱿鱼皮胶原蛋白。在确定该色素特征吸收波长为420 nm条件下,分别研究了活性炭添加量、脱色时间、溶液p H值和脱色温度对鱿鱼皮胶原蛋白液色素脱除效果影响。在单因素实验基础上,选择脱色时间30 min,进行活性炭添加量、溶液p H值、脱色温度三因素三水平BoxBehnken中心组合响应面分析试验。结果表明,活性炭吸附鱿鱼皮胶原蛋白液色素最佳条件为活性炭添加量4.2%,溶液p H值2.27,脱色温度35°C,该条件下鱿鱼皮胶原蛋白液的脱色率为45.6%,蛋白质和氨基酸损耗率分别为19.65%和22.93%。脱色后鱿鱼皮胶原蛋白的甘氨酸含量最高(136.02 mg/g,相对含量23.05%),谷氨酸、精氨酸和脯氨酸含量也较高,而半胱氨酸和蛋氨酸总量不到1%,符合水产蛋白氨基酸和I型胶原蛋白氨基酸特点。  相似文献   

章丘地区土壤硒的含量分布及影响因素   总被引：2，自引：0，他引：2       下载免费PDF全文

赵西强  张贵丽 《山东国土资源》2015,31(3)

以章丘地区土壤为对象,系统分析了表层、深层土壤及8条剖面土壤中Se元素的含量水平,研究了土壤中Se的分布特征及其与土壤类型、成土母质、地形地貌和土壤理化性质及组分的关系。结果表明：章丘地区表层土壤中Se含量在0.1～0.8mg/kg之间,以中硒土壤为主,富硒土壤面积173km2。土壤类型中,水稻土Se平均含量水平最高,为0.55mg/kg;成土母质中以石炭—二叠纪泥页岩发育的土壤Se含量最高;剖面土壤中的Se主要在表层富集。影响章丘地区土壤Se含量分布的主要因素是成土母质、地形地貌、土壤pH、有机质及土壤中硫、铁铝氧化物等组分。  相似文献   

Elemental and organic carbon in atmospheric aerosols at downtown and suburban sites in Prague   总被引：1，自引：0，他引：1  

Jaroslav Schwarz  Xuguang Chi  Willy Maenhaut  Martin Civi&#x;  Jan Hovorka  Ji&#x;í Smolík 《Atmospheric Research》2008,90(2-4):287-ICNAA07

Organic and elemental carbon (OC and EC) content in PM₁₀ was studied at two sites in Prague, which were located in a suburb and in the downtown. Similar overall average levels were found for both species and also for the PM₁₀ mass at the two sites (i.e., 5.5 and 4.8 μg/m³ for OC, 0.74 and 0.80 μg/m³ for EC, and 33 μg/m³ and 37 μg/m³ for the PM₁₀ mass at the suburb and downtown site, respectively), but substantial differences were observed between the two sites in some seasons and/or meteorological situations. Approximately three times higher values were found for OC in winter compared to summer, with a higher winter/summer ratio for the suburban site. The differences for EC were smaller, but still, compared to summer, more than two times higher EC levels were observed during autumn at the suburban site and 1.5 higher EC levels in winter and autumn at the downtown site. The lowest OC to EC ratios at the suburban site were 3.4, while they were around 1.3 for the downtown site. It was found that the origin of the air masses had a major impact on the observed PM₁₀ mass and OC levels, with largest concentrations noted for air masses recirculating over central Europe and arriving from southeastern Europe in winter. Trajectories coming from the west and northwest originating above the Atlantic Ocean and the Artic brought the cleanest air masses to the sites. For EC the largest difference between the two sites was observed for northwesterly winds during the non-heating season when the suburban site was upwind of Prague.  相似文献   

Chemical Characteristics of Carbonaceous Aerosols During Dust Storms over Xi'an in China   总被引：1，自引：0，他引：1  

LI Xuxiang  CAO Junji  Judith CHOW  HAN Yongming  Shuncheng LEE  John WATSON 《大气科学进展》2008,25(5):847-855

Characterization of carbonaceous aerosols including CC （carbonate carbon）, OC （organic carbon）, and EC （elemental carbon） were investigated at Xi＇an, China, near Asian dust source regions in spring 2002. OC varied between 8.2 and 63.7μgm^- 3, while EC ranged between 2.4 and 17.2 μ m^-3 during the observation period. OC variations followed a similar pattern to EC and the correlation coefficient between OC and EC is 0.89 （n=31）. The average percentage of total carbon （TC, sum of CC, OC, and EC） in PM2.5 during dust storm （DS） events was 13.6%, which is lower than that during non-dust storm （NDS） periods （22.7%）. CC, OC, and EC accounted for 12.9%, 70.7%, and 16.4% of TC during DS events, respectively. The average ratio of OC/EC was 5.0 in DS events and 3.3 in NDS periods. The OC-EC correlation （R^2=0.76, n=6） was good in DS events, while it was stronger （R^2=0.90, n=25） in NDS periods. The percentage of watersoluble OC （WSOC） in TC accounted for 15.7%, and varied between 13.3% and 22.3% during DS events. The distribution of eight carbon fractions indicated that local emissions such as motor vehicle exhaust were the dominant contributors to carbonaceous particles. During DS events, soil dust dominated the chemical composition, contributing 69% to the PM2.5 mass, followed by organic matter （12.8%）, sulfate （4%）, EC （2.2%）, and chloride （1.6%）. Consequently, CC was mainly entrained by Asian dust. However, even in the atmosphere near Asian dust source regions, OC and EC in atmospheric dust were controlled by local emission rather titan the transport of Asian dust.  相似文献   

内蒙古中南部出露地壳元素丰度值的估算     

孟月玥  陈岳龙  林宇 《地质通报》2010,29(6):880-890

运用区域大规模采样方法,对内蒙古中南部地区所采样品进行元素丰度值加权计算,这是建立区域地壳模型的基础工作之一,同时也为化探异常的检出提供较为准确的背景值。研究区涉及内蒙古地轴和内蒙古中部造山系2个构造单元。采用加权求平均值的方法,得到内蒙古中南部出露地壳10种常量元素氧化物和40种微量元素的丰度值。经地表热流值、地震平均波速和元素比值方法检验后证明所得结果合理。计算所得内蒙古中南部出露地壳平均成分为花岗闪长质,与目前一般认为的结论相同。将结果与其他地区进行比较分析后可知,内蒙古中南部出露的地壳与全球上地壳的组成基本一致。由微量元素、稀土元素的图解和内蒙古中南部出露地壳的元素丰度与中国东部出露地壳元素丰度的对比可以看出,整体上,内蒙古中南部具有较强的壳内分异作用和地壳增生作用(地幔物质加入)。  相似文献   

上海市近岸海域表层沉积物类型与元素丰度相关关系特征   总被引：1，自引：1，他引：0  

何中发 《上海国土资源》2010,(1):1-5

通过上海市近岸海域多目标区域地球化学调查,共采集947件表层沉积物样品,分析测试了52种化学元素以及pH值和有机碳等指标。总结了该区域表层沉积物及深层沉积物类型和分布特征,沉积物类型主要为细砂、粉砂质砂、砂质粉砂、粉砂、粘土质粉砂,其中粘土质粉砂分布最为广泛。元素含量与砂含量呈正相关的元素主要为SiO2、Sr、Na2O等。其它指标大都与粘土含量呈正相关关系。  相似文献   

Deciphering signals of late Holocene fluvial and aeolian supply from a shelf sediment depocentre off Senegal (north‐west Africa)     

Jean Nizou  Till J.J. Hanebuth  Christoph Vogt 《第四纪科学杂志》2011,26(4):411-421

High‐resolution climatic records of the late Holocene along the north‐west African continental margin are scarce. Here we combine sediment grain size, elemental distribution and mineral assemblage data to trace dust and riverine sources at a shallow‐marine sediment depocentre in the vicinity of the Senegal River mouth. The aim is to understand how these terrigenous components reflect climate variability during the late Holocene. Major element contents were measured and mineral identification was performed on three sub‐fractions of our sediment core: (i) fluvial material < 2 µm, (ii) aeolian material of 18–63 µm and (iii) a sub‐fraction of dual‐origin material of 2–18 µm. Results show that more than 80% of the total Al and Fe terrigenous bulk content is present in the fluviogenic fraction. In contrast, Ti, K and Si cannot be considered as proxies for one specific source off Senegal. The Al/Ca ratio, recording the continental river runoff, reveals two dry periods from 3010 to 2750 cal a BP and from 1900 to 1000 cal a BP, and two main humid periods from 2750 to 1900 cal a BP and from 1000 to 700 cal a BP. The match between (i) intervals of low river runoff inferred by low Al/Ca values, (ii) reduced river discharge inferred by integrated palynological data from offshore Senegal and (iii) periods of enhanced dune reactivation in Mali confirms this interpretation. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献