冷原子—无色散原子荧光光谱法测定奶粉中汞的有关问题的探讨

本文第一次提出汞样品经硝酸消化后，汞（Ｈｇ）与氮氧化物（ＮｘＯｒ）形成络合物，在经典的加氯化亚锡（ＳｎＣｌ２）还原时，生成Ｈｇ与ＮＯ并能同时逸出，确定了Ｈｇ与ＮｘＯｒ存在配位关系，对汞的测定在数学计量上增加到１．５倍，结果表明，应用五氧化二矾消化奶样品能如实反映这一关系，并精确地得出其汞含量，在联合国环境规划署和粮食农业及世界卫生组织食品污染联合监测计划的第八届铅，镉，汞的分析质量保证中，应用本法     

共价氢化物与汞离子反应的研究：Ⅱ.痕量硒的高灵敏分析新方法

本文详细研究了硒化氢与汞离子反应条件并建立了氢化物发生－冷原子荧光法间接测定痕量硒的新方法。考察了各种实验条件，并将此方法用于合成水样分析，得到一些有意义的结果。     

Evaluation and applications of a gaseous mercuric chloride source

In this study, a diffusion-type device for generating gaseous mercuric chloride (HgCl₂) was systematically evaluated and applied to validate the annular denuder method for sampling gaseous HgCl₂ species in a synthetic gas stream. The results show that it takes at least 48 h for the system to reach a steady-state condition after the diffusion cell reaches the temperature set-point and the carrier gas is activated. The primary Hg species from the source was proven to be HgCl₂. In the temperature range from –5.00 to 11.80 °C, the Hg emission rates from the source vary from 1.8 to 14.2 pg min^–1. It is shown that, under the experimental conditions examined, KCl-coated annular quartz denuders designed for ambient reactive gaseous mercury (RGM) collection could quantitatively collect HgCl₂. It is also demonstrated that the impactors used to remove coarse airborne particulate matter could lead to a loss of up to one third of the HgCl₂ in the gas stream.     

偏最小二乘火焰原子吸收光谱法同时测定汞和钴

本文研究了偏最小二乘原子吸收光谱法同时测定Hg和Co的方法,校正中Co253.649nm对Hg 253.652nm的吸收红重叠干扰,用Hg空心阴极灯同时一合成样中的Hg和Co,方法快速、简单、准确,结果令人满意。     

Continuous flow electrolytic cold vapor generation atomic fluorescence spectrometric determination of Hg in water samples

The determination of trace concentrations of Hg in water samples by the use of electrolytic cold vapor generation (ECVG) system and AFS was studied. Several buffer solutions were used and the detection limits with these systems were found to be by a factor of 1–2 lower than in the conventional electrolytic cold vapor generation system. Comparing with the traditional inorganic acid, phosphate buffer solution (PBS) increased the signal intensity of Hg vapor from electrolytic generation on Pt cathode and reduced the impact of cathode erosion on the stability of signal intensity. Moreover, buffer solution has better interference tolerance. The effects of the electrolytic conditions and interference ions on the ECVG have been studied. Under optimized conditions and with PBS as catholyte the detection limit for Hg was found to be 0.27 ng L⁻¹. The relative standard deviation was 2.8% for 11 consecutive measurements of 1 μg L⁻¹ Hg. This method has been applied in the determination of inorganic Hg in Yangtze River water.     

One‐pot Preparation,Spectroscopic and Structural Characterization of Mercury(II) Complexes of Bulky Diimines with Halides and Pseudohalides

The preparation and characterization of two novel HgCl₂ and Hg(SCN)₂ complexes with bis[N‐(2‐tert‐butylphenyl)imine]acenaphthene is here described. One‐pot reaction techniques were used, leading to high yields of 75 % and 81 %, respectively. The complexes were characterized by microanalysis, i.r. and ¹HNMR spectroscopy, and by single crystal X‐ray diffraction. The structures of the complexes present similar characteristics, the most outstanding being the formation of dimers via intermolecular interaction. Whereas the HgCl₂ complex shows a unidimensional network due to strong π–π interactions, its Hg(SCN)₂ counterpart displays a supramolecular arrangement resulting from non classical hydrogen bond formation.     

Hg diffusion in books of XVIII and XIX centuries by synchrotron microprobe

The pigment vermilion (HgS) was used to color the fore edge, tail and head of books. Dissemination and quantification of Hg present in the ink used to color books from XVIII and XIX centuries are reported. Mercury is a very toxic element for the human body, therefore it is extremely important to know whether Hg tends to disseminate throughout the paper or stays confined to the borders of the books with less danger for readers. Synchrotron X-ray microprobe was used to evaluate Hg dissemination from the border to the centre of the paper sheet. The diffusion pattern of Hg was compared with the results obtained by a portable X-ray fluorescence spectrometer and mean quantitative calculations were obtained by a stationary X-ray fluorescence system with triaxial geometry. The results showed high concentrations of Hg in the external regions, but no diffusion was observed for the inner parts of the paper.     

底泥中汞的流动注射-氢化物原子吸收光谱法检测

流动注射分析系统与氢化物发生原子吸收光谱仪联用，测定底泥中的汞、操作简便，稳定性较好，而且样品和试剂消耗量较少，可用来进行痕量样品的测定。方法的线性范围为1－20μg/L,检出限为0.005mg/kg。     

Determination of As,Cd, Pb,and Hg in urine using inductively coupled plasma mass spectrometry with the direct injection high efficiency nebulizer

The application of the large-bore direct injection high efficiency nebulizer (LB-DIHEN) for the determination of arsenic (As), cadmium (Cd), lead (Pb), and mercury (Hg) in urine by inductively coupled plasma mass spectrometry (ICP-MS) is described. The LB-DIHEN is compared with the standard method using a concentric pneumatic nebulizer and cyclonic spray chamber. In addition to the toxicological significance of As, Cd, Pb, and Hg, these elements represent a cross-section of analytical issues including spectral interferences (e.g., ⁴⁰Ar³⁵Cl⁺ on ⁷⁵As⁺ and ⁹⁸Mo¹⁶O⁺ on ¹¹⁴Cd⁺) and memory effects (Hg). In this study, the low sample consumption of the LB-DIHEN is used to reduce the volume of urine needed for analysis, and to reduce the volume of final diluted sample required for analysis. Eliminating the spray chamber and reducing the dead volume of the nebulizer reduces memory effects, especially for analytes such as Hg. The Dynamic Reaction Cell (DRC) is used in this study to attenuate the background level of ArCl⁺ in spite of the increase in the solvent load and, in turn, the urine matrix (chloride) delivered to the plasma by the LB-DIHEN. This is the first report on coupling the LB-DIHEN to a standard autosampler for unattended sample analysis. The robustness of direct injection nebulization for routine analysis and the issues associated with automation of the sample introduction process are discussed. Although the figures of merit (sensitivity, limit of detection, and precision) determined for both nebulizers are slightly poorer for the LB-DIHEN than for the concentric pneumatic nebulizer, there is not a clinically significant difference between the results for both sample introduction systems. The accuracy of results is assessed using archived urine materials that are circulated by several different proficiency testing (PT) programs and external quality assessment schemes (EQAS). Results obtained using the LB-DIHEN were within the acceptable range established by a consensus pool generated using different methods, none of which are likely to be using direct injection nebulization. Internal quality control sample results obtained using the LB-DIHEN were compared to those obtained using the conventional nebulizer. Reported results were similar for both nebulizers. Thus, these results show that the LB-DIHEN is certainly feasible for the analysis of urine specimens.