Determination of Iron in Coastal Zone Water with Improved National Standard Method

为了更加准确地检测海岸带水体中的铁含量,将邻菲啰啉分光光度法测定水质铁(国标法)的方法进行了改进。在邻菲啰啉分光光度法的基础上,在p H调节方式、比色皿皿差和显色剂三个方面进行改进。结果表明,改进后方法的线性、准确度和精密度都优于国标法。但改变p H调节方式和扣除比色皿皿差后检测低浓度铁的水样的精密度依然较差(RSD>5%),说明邻菲啰啉的灵敏度较低。以5-Br-PADAP为显色剂用分光光度法检测水样时,方法的准确度和精密度较好(RSD<5%,加标回收率在96.0%~106%之间),该方法可以用于海岸带水体中铁的检测

POLLEN PRESERVATION of ORYCHOPHRAGMUS VIOLCEUS

诸葛菜新鲜花粉在室温下寿命较短，7天时全部失去生活力.在4℃低温下，花粉寿命延长至15天；在-20℃以下，均失去生活力，干燥花粉在-20℃保存40天时，萌发率降至25%；在液氮（ln）中，花粉生活力基本不变、经dMSO溶液预处理的冰冻花粉生活力很低，在-20℃，花粉游离脯氨酸含量随储存时间延长略有下降，在ln中，花粉游离PrO不随时间变化而变化，冰冻保存20天的花粉均能正常授粉结实.Pollen preservation of O.violaceus has been preliminarily studied.The result showed that pollen liFe span was shorter at room temperature.Pollen viability was lost completely in 7 days at room temperature or in 15 days at 4℃.Dried pollens couldn't risist Frost.During a period of 40 days,the survival percentage of dried pollens stored at-20℃ declined to 25%,whereas the viability of dried pollens stored in liquid nitrogen (LN ) remained constant.The viability of Frozen pollens pretreated with DMSO solution (TFF$18 M)was very low.As time went out,the content of Free Pro in pollens declined slightly at -20℃ and did not change in LN.Compared with Fresh pollens,the content of Free Pro in pollens stored in LN rose up a little,but the diFFerence was not remarkable.Pollens,stored respectively at -20℃ and in LN For 20 days,could be used to pollinate and the pollinated Flowers developed Fruit and seeds

Advances in determination of phosphate in seawate

磷是海洋生态系统中重要的生源要素之一,它参与或控制了发生在生物圈中的许多生物地球化学循环过程。最近的研究表明,磷是产生水体富营养化的限制性营养元素之一[1-4],当水体中磷含量过高时,会造成藻类的过度繁殖,导致产生水体富营养化等生态环境问题,欧盟立法规定将水体中含有0.1 mg/L磷酸盐作为判断环境水体是否暴发蓝藻的指标[5]。

海水中磷酸盐的检测方法研究进展

磷是海洋生态系统中重要的生源要素之一,它参与或控制了发生在生物圈中的许多生物地球化学循环过程。最近的研究表明,磷是产生水体富营养化的限制性营养元素之一1-

Method for Determination of Total Dissolved Iron in Coastal Samples

铁是海洋初级生产力的重要限制因素,在地球生物化学循环中起到重要作用。对于入海河流及近岸海域而言,铁的含量、形态丰富,是大洋海水中铁的重要来源,因此建立一个适用于海岸带区域溶解态总铁的分析检测方法,对于进一步认识铁循环机制和有效预防海洋环境污染等具有重要意义。文章采用阴极溶出伏安法,考察了缓冲溶液,电化学参数等对实验测定的影响。结果表明:在0.01 mol/L,pH=4.0的HAc-NaAc缓冲溶液体系中,-0.2 V恒电位搅拌富集5 s后阴极化扫描,Fe~(3+)在-1.24 V左右出现阴极溶出峰。在最优的条件下,0.1~100 μmol/L范围内,Fe~(3+)的溶出峰电流与其浓度呈很好的线性关系。对实际样品(入海河流、近岸海水和沉积物)检测的回收率均在90%~110%之间,表明该方法适用于海岸带区域中溶解态总铁的检测

适用于海岸带区域溶解态总铁的检测方法研究

铁是海洋初级生产力的重要限制因素,在地球生物化学循环中起到重要作用。对于入海河流及近岸海域而言,铁的含量、形态丰富,是大洋海水中铁的重要来源,因此建立一个适用于海岸带区域溶解态总铁的分析检测方法,对于进一步认识铁循环机制和有效预防海洋环境污染等具有重要意义。文章采用阴极溶出伏安法,考察了缓冲溶液,电化学参数等对实验测定的影响。结果表明:在0.01 mol/L,pH=4.0的HAc-NaAc缓冲溶液体系中,-0.2 V恒电位搅拌富集5 s后阴极化扫描,Fe~(3+)在-1.24 V左右出现阴极溶出峰。在最优的条件下,0.1~100 μmol/L范围内,Fe~(3+)的溶出峰电流与其浓度呈很好的线性关系。对实际样品(入海河流、近岸海水和沉积物)检测的回收率均在90%~110%之间,表明该方法适用于海岸带区域中溶解态总铁的检测

烟台近海水体不同形态铁的检测分析

本文采用2,3-二羟基萘作为三价铁的络合剂,KBr O_3作为催化剂,在采样过程中加入2,2'-联吡啶掩蔽活性二价铁,用催化吸附阴极溶出法对烟台近岸海水中总活性铁、活性三价铁、活性二价铁、溶解态总铁以及有机络合态铁等5种形态铁的含量进行了分析测定,建立了一套适用于分析近岸海水中5种不同形态铁的方法.该方法测定的最低检出限为0.84 nmol·L~(-1),灵敏度根据所加入铁浓度不同分别为12.5、3.95、1.25 n A·L·nmol-1.此外,应用文中方法对标准海水样品CASS-5和NASS-6中的铁含量进行测试,测试结果与标准海水中铁的浓度基本符合

Pollution Assessment of Arsenic and Mercury in Surface Sediments from Intertidal Zone of Dagu River Estuary

Research of surface sediments from intertidal zone of Dagu estuary in Qingdao was carried on at the end of October in 2014 and the end of July in 2015. The content of mercury and arsenic of 15 surface sediments in dry season and 45 surface sediments in wet season was determined,and the contamination assessment was conducted. Results showed that the content of arsenic in dry season satisified Class Ⅱ of Marine Sediment Standard,while the content of arsenic in wet season satisfied the Class I. The content of mercury satisified the Class I of Marine Sediment Standard both in dry and wet seasons. The contamination assessment was conducted with geoaccumulation index (I_(geo))and potential ecological risk index (E_r~i). Results demonstrated that the arsenic of surface sediment in dry season was mild to moderate polluted,and the mercury was unpolluted to mild polluted. The arsenic of surface sediment in wet season was unpolluted,and the mercury was also unpolluted to moderate polluted. The potential ecological risk level of arsenic in dry season was mild to moderate,while that in wet season was mild. The potential ecological risk level of mercury was mild to high in both seasons