Study On Application Of Slotted Quartz Tube Atom-Trapping Atomic Absorption Spectrometry

In order to raise the sensitivity of flame atomic absorption spectrometry , The scientific workers have already done a large amount of work in technology of entering, technology of atomization, increase sense technology, coupling technique, etc, at present, and have made certain achievement. Among them, slotted quartz tube atom-trapping atomic absorption spectrometry is a relatively ideal kind of method .This law turn on a slotted quartz tube above the burning device one, Make the slot and slot of burning device aim at and keep certain distance ( height of slotted tube), The light beam is passed from inning charge of the central tube, when the sample solution is gushed out and enters the flame and atomization, Because the time that the atom stays in the mere road is lengthenned,its density increases, the absorption of the wavelength of characteristic increases, Thus make the sensitivity measured improved.On the basis of ordinary method of quartz slotted tube,this text adopt the poor flame is caught and collected the rich flame releases technology, Have improved the sensitivity of determining the element remarkably. This text adopt ordinary flame atomic absorption spectrometry, quartz slotted tube atomic absorption spectrometry and slotted quartz tube atom-trapping atomic absorption spectrometry to determine the 5 kinds of elements such as Pb, Cu, Ag, Cd and Fe,etc. And has compared their sensitivity. The conclusion is: Adopt quartz slotted tube atomic absorption spectrometry determine 5 kinds of elements, such as Pb, Cu, Ag, Cd and Fe,etc., Its Sensitivity at most can improve 7.92, 3.81, 5.26, 2.97,3-53 separately than ordinary flame atom absorption spectrometry;Adopt slotted quartz tube atom-trapping atomic absorption spectrometry determine 5 kinds of elements, such as Pb, Cu, Ag, Cd and Fe,etc., Its Sensitivity at most can improve 89.44, 37.51, 31.47, 60.97, 29.18 separately than ordinary flame atom absorption spectrometry ;It measures the limit and up to 0. 0106, 0.0146, 0.0040, 0.0013, 0.0217#g-mL'' separately.This text still compares the increasing quick function of slotted quartz tube atom-trapping atomic absorption spectrometry to different density metal ion through the experiment, Point out , slotted quartz tube atom-trapping atomic absorption spectrometry increase to low density element quick result superior to the high density element for the first time.This text adopt slotted quartz tube atom-trapping atomic absorption spectrometry determine Xuzhou running water and Xuzhou old Yellow River Pb, Cu, Ag, Cd and Fe element separately also. The survey result is:The content of the Pb, Cu, Ag, Cd, Fe is 0.021, 0.049, 0.011, 0.029, 0.27#g-mL-1 respectively in running water;The content of the Pb, Cu, Ag, Cd, Fe is 0.049, 0.057, 0.022, 0.029, 039#g-mL-1' respectively in the old Yellow River.The results of recovery test is in 91.3%-105.2%.Prove through experiment,slotted quartz tube atom-trapping technology whether one concentrate and await measuring physics of atom in advance rich to collect technology among flame, It can offer extremely high density of atom for atom to be absorbed and determined, concentrate with routine chemistry method compare with in advance, The merit of this law is: Needn't put into the chemical reagent , deal with the chemistry pollution or loss in the course of concentrating in advance before avoiding chemistry, Have saved the time of analysing, has improved the sensitivity and degree of accuracy of analysing; And this method have the characteristics that the device is simple, easy to use also, so it is one more ideal trace that analyse technology, Suitable for the survey of many kinds of elements.