X-Ray Diffraction Studies on Structure of Solutions: 3. A Relative Transparent Factor for Intensity Correction of Window on Liquid Sample Cell with Powder Diffractomcter
Then, this paper introduces the work of this experiment including the following several respects:(1) Assemble a simple device for SPME with a micro- syringe, and set up the system for appraising the enrichment ability of SPME coating to solid sample and liquid sample.
The recovery rate was 93.4% ～101.4% and 94.8%～100.3% for chlorhexidine acetate in liquid samples measured by ultraviolet spectrophotometry and 85.3%～94.1% and 90.6%～98.5% for chlorhexidine acetate in tooth paste measured by HPLC.
This paper presents a kind of low temperature target system(temperature between 180～290K)for the two stage light gas gun and the technique for preparing molecular liquid samples of high purity at low temperatures.
The stretching of a liquid sample, squeezed out in the vertical direction from an aperture of an arbitrary form, is investigated.
The device measures the intensity of the acoustic emission (AE) accompanying crystallization of a liquid sample.
The fragility parameter m and activation energy for viscous flow of the liquid sample were calculated to be: m = 31.66, E = 10689.17 K, respectively.
A Gas-liquid Equilibrium Sampling System was developed to enable the introduction of a representative amount of a gas-liquid sample into a gas chromatograph or a mass spectrometer.
An excess of gaseous ethylene oxide is added to a liquid sample; the 2-chloroethanol formed is then analyzed by gas chromatography.
The IR spectra of irradiated liquid samples indicate the formation of linear and cyclic polystructures.
Some parameters (injected sample volume and the completeness of sample transfer) in the injection of large-volume gas-vapor and liquid samples into a wide-bore capillary column with intermediate sorption preconcentration were examined.
The procedure allows the determination of phthalic acids in the concentration range from 0.02 to 2 mg/L in liquid samples and from 0.03 to 3 mg/m3 in air.
Application of the real-time holographic interferometry technique to the analysis of liquid samples by means of electrophoresis in a flat capillary is demonstrated.
It is shown that the manual capsule injection system for the introduction of liquid samples can give results of very high precision and reproducibility.
The JU-1 uranium laser analyser can be applied to direct and rapid determination of trace levels of uranium in surface and ground waters. Solid samples can also be analyzed after simple treatment. The detection limit for surface waters is 0.05 ppb U .Measurement accuracy is better than ±10% at 0.1-1ppb U, or ±5% at 1-20ppb U .
The determination of tungsten in ores by x-ray fluorimetry of solution was investigated. The samples were decomposed by phosphoric acid and nickel was used as the internal standard in the solution. On-line data processing with VRA-2 x-ray fluorescence spectrometer and DJS-110 computer made in china was carried out.The effects of particle-size, mineralogy and matrix were eliminated and the drift of the instrument was compensated in this method.A large amount of Mo Pb Zn Cu Ca Mn and Fe, a certain amount of sulfuric...
The determination of tungsten in ores by x-ray fluorimetry of solution was investigated. The samples were decomposed by phosphoric acid and nickel was used as the internal standard in the solution. On-line data processing with VRA-2 x-ray fluorescence spectrometer and DJS-110 computer made in china was carried out.The effects of particle-size, mineralogy and matrix were eliminated and the drift of the instrument was compensated in this method.A large amount of Mo Pb Zn Cu Ca Mn and Fe, a certain amount of sulfuric acid and phosphoric acid over a suitable range didn't interfere with the results of the determination.This method was suitable for the determination of tungsten in ores containing WO_3 from 0.2 to 80% and liquid samples. The standard deviations of the determination for the samples containing 5.83 and 69.81% WO_3 were 0.04 and 0.17 respectively. The determination was fast and accurate.
A new amperometric flow-through detector applied to flow injection analysis and continuous flow analysis is designed. It is composed of a gold tubular working electrode, a stainless-steel tubular counter electrode, and a silver chloride referenceelectrode.An expression equation of sampling frequency has been given in this paper as follow:f=ut/(πr~2l+DV_s+KV_g). To a given system analytical rate is only a function of volume fluid velocity.By use of the FIA technique, response is linear for levels from a few tenth...
A new amperometric flow-through detector applied to flow injection analysis and continuous flow analysis is designed. It is composed of a gold tubular working electrode, a stainless-steel tubular counter electrode, and a silver chloride referenceelectrode.An expression equation of sampling frequency has been given in this paper as follow:f=ut/(πr~2l+DV_s+KV_g). To a given system analytical rate is only a function of volume fluid velocity.By use of the FIA technique, response is linear for levels from a few tenth microgram to several milligram per liter of sotution.With this approach, analytical rates of 100 samples per hour can be achieved. To S~=, Ag~+, Hg~(++) and I~-,their detection timits are 0.5, 2, 5 and 10ppb respectively, and the relative standard deviations are≤3%. Several factores to effect on limiting current have also been discussed.
液体样品
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