The paper discussed the determination of trace lead in drinking water by the adoption of Zeeman effect of graphite furnace atomic absorption method,and studied the temperature raising procedure of graphite furnace as well as the effects of matrix modifier on the determination.
Zeeman effect of graphite furnace atomic absorption spectrophotometry was adopted to determine trace lead in environmental water samples, also the temperature raising procedure of graphite furnace and the effect of matrix modifier on the determination were studied.
The paper discussed the measurement of trace Pb and Cd in Calcium (Ca) nourishment oral drinks by the adoption of Zeeman effect of graphite furnace atomic absorption method, and studied the temperature raising procedure of graphite furnace as well as the effects of matrix modifier on the determination .
Trace Cd in Ca nourishment and Zn nourishment was determined by Zeeman effect-graphite furnace atomic absorption method. The effects of temperature raising procedure of graphite furnace and the matrix modifier on the determination were studied.
Micro selenium and arsenic in water were determined by grapmite furnace atomic absorbtion spectrophotometry method method (GFAAS) and through large number of experiments and choosing different measurement condition, optimal temperature program espicially the gas flowrate of atomizing was found. The analysis method detection hot as follows: As 0.6 μg/L, Se 0.5 μg/L.
The temperature program comprised two phases: initially the temperature was set at 100 ℃ for 2 min. It was then ramped to 300 ℃ at a rate of 10 ℃/min and held for 14 min.
柱升温程序为:柱初温100℃,恒温保持2 min,以10℃/min的速度升温至300℃,保持14 min.
In this article,a method is developed to determine the terpene components in the essential oil of cedarwood, with HP-5MS crossed silicon capillary column,and the temperature program:120 ℃2 ℃/min 200 ℃.
Furthermore, the GC-MS-SIM method are also developed for the analysis of 101pesticides residues in vegetables and fruits in this paper. Through the investigation ofdifferent condition such as gas flow、temperature program and ion fragments groupingand etc.
Methods Experiment and study on furnace program of GFAAS such as dry, pyrolysis, atomization, clean-out were carried out and furnace program by aid of plotting the absorbance-temperature curve was confirmed.
Heat the test group moulds with the same heating procedure to the target temperature, then cast at the mould temperature 600 , 450 ,300 , 150 respectively with a Cyclarc titanium casting machine.
The test indicates that if the dyeing rate can be controlled slower than the critical one of a dye with a fast initial dyeing rateby changing the heating procedure, a level dyeing may be reached.
After a pre-column splitting the individual compounds of the sample are separated by a uniform temperature program on two different columns in parallel.
By connecting capillary columns of different polarity in series and by changing the temperature program gradient, a system of variable polarity is obtained.
Analytical separations were on a dimethylsilicone capillary column using a temperature program, and detection was by selected ion monitoring of the electron impact generated fragments m/z 94, 182, 210, and 300.
A suitable heating procedure was established whereby 2.0-kg packages were heat processed at 90°C for 25 min, corresponding to an average pasteurization value, PV70,10, of 14 min.
IFN-γ production from PHA-stimulated peripheral blood mononuclear cells was gradually and significantly increased in the 2?days following the heating procedure, peaking at 36?h post-treatment.
The sample InP is dissolved with hydrochloric acid. The determination limit and relative standard deviation of the determination are 0.3ppm and 6% respectively.The recovery of Fe added into the sample is 98%. The results show that the absorbance of Fe increases by 2-3 times when Pingdu tubes (a pyrolytically coated graphite tube) are coated with the saltsolution of tantalum. The precision of the determination of Fe in InP is also improved. The absorbance of Fe was about 15% larger than that of the conventio...
From the rate equation, a general expression of the band movement process have been given. It shown that the band movement process is approximately independent of the diffusion coefficient and mass-transport rate so it is reasonable to calculate the X-t relations in the chromatographic balance theory. On this basis, the X-t relations under programmed tem perature was discussed. The results give expression of the influence of partition coefficient, temperature program raised, and pressure correction in calcu...
The experimental results at variant programs of raising temperature are care- fully examined during the synthetic process of ZnP_2 while P and Zn are located at the opposite ends of a sealed evacuated quartz tube. It is found that the phosphorus vapour pressure has an effect on zinc phosphorus formation. When the phosphorus vapour pressure is not high enough, Zn_3P_2 will be formed; When the phosphorus vapour pressure is high enough but lower than 4 atm., both red tetragonal ZnP_2 and black monoclinic ZnP_2...
升温程序
temperature raising procedure
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