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91.
《环境科学学报(英文版)》2023,35(4):531-544
The presence of toxic mercury (II) in water is an ever-growing problem on earth that has various harmful effect on human health and aquatic living organisms. Therefore, detection of mercury (II) in water is very much crucial and several researches are going on in this topic. Metal-organic frameworks (MOFs) are considered as an effective device for sensing of toxic heavy metal ions in water. The tunable functionalities with large surface area of highly semiconducting MOFs enhance its activity towards fluorescence sensing. In this study, we are reporting one highly selective and sensitive luminescent sensor for the detection of mercury (II) in water. A series of binary MOF composites were synthesized using in-situ solvothermal synthetic technique for fluorescence sensing of Hg2+ in water. The well-distributed graphitic carbon nitride quantum dots on porous zirconium-based MOF improve Hg2+ sensing activity in water owing to their great electronic and optical properties. The binary MOF composite (2) i.e., the sensor exhibited excellent limit of detection (LOD) value of 2.4 nmol/L for Hg2+. The sensor also exhibited excellent performance for mercury (II) detection in real water samples. The characterizations of the synthesized materials were done using various spectroscopic techniques and the fluorescence sensing mechanism was studied. 相似文献
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Critical algal blooms in great lakes increase the level of algal organic matters(AOMs),significantly altering the composition of natural organic matters(NOMs) in freshwater of lake.This study examined the AOM's characteristics of Nitzschia palea(N.palea),one kind of the predominant diatom and an important biomarker of water quality in the great lakes of China,to investigate the effect of AOMs on the variation of NOMs in lakes and the process of algal energy.Excitation–emission matrix fluorescence(EEM) spectroscopy,synchronous fluorescence(SF) spectroscopy and deconvolution UV–vis(D-UV) spectroscopy were utilized to characterize AOMs to study the effects of nutrient loading on the composition change of AOMs.From results,it was revealed that the phosphorus is the limiting factor for N.palea's growth and the generation of both total organic carbon and amino acids but the nitrogen is more important for the generation of carbohydrates and proteins.EEM spectra revealed differences in the composition of extracellular organic matter and intracellular organic matter.Regardless of the nitrogen and phosphorus concentrations,aromatic proteins and soluble microbial products were the main components,but the nitrogen concentration had a significant impact on their composition.The SF spectra were used to study the AOMs for the first time and identified that the protein-like substances were the major component of AOMs,creating as a result of aromatic group condensation.The D-UV spectra showed carboxylic acid and esters were the main functional groups in the EOMs,with –OCH_3,–SO_2NH_2,–CN,–NH_2,–O– and –COCH_3functional groups substituting into benzene rings. 相似文献
95.
电感耦合等离子体质谱法测定地下水中痕量元素 总被引:1,自引:0,他引:1
采用电感耦合等离子体质谱法(ICP-MS)同时测定地下水中痕量元素。结果表明,ICP-MS可同时测定地下水中的16种元素,方法检出限为0.02~0.2μg/L,元素的精密度(RSD,n=5)为1.46%~4.36%,加标回收率为96.6%~105.6%,符合环境监测无机组份测试质量控制的要求。该方法应用于直接测定元素浓度范围在ng/L~mg/L级的实际地下水样品,具有样品前处理简单、干扰少、测定快速、元素同时分析、省时省力等优点。 相似文献
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Peng Li Lingqian Dong Han Jin Jingren Yang Yonghui Tu Chao Wang Yiliang He 《Frontiers of Environmental Science & Engineering》2022,16(12):159
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采用微波消解-原子荧光光谱法测定了垃圾焚烧飞灰中铅的含量。重点研究了铁氰化钾的用量以及加入盐酸羟胺对测定结果的影响。试验结果表明:加入铁氰化钾可以促进铅烷生成,盐酸羟胺可起到抑制干扰的作用。方法的检出限为0.39μg/L,回收率为83.6%~101.3%。 相似文献
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对采用燃烧器偏转-火焰原子吸收法测定水中钾、钠、钙、镁的仪器条件及灵敏度、检出限、测定下限、精密度、准确度进行了研究。发现该方法在没有铯盐及镧盐加入的情况下,曲线线性好、灵敏度高、精密度好、准确度高,能够满足实际分析的需要。 相似文献
100.
Shengdong Liu Enxiang Shang Jingnan Liu Yining Wang Nanthi Bolan M.B. Kirkham Yang Li 《Frontiers of Environmental Science & Engineering》2022,16(1):8