Thin Resin Phase Spectrophotometry In The Analysis Of Environmental Samples Applied Research

This paper explains the development in the study of resin phase spec-trtophotometric method at home and abroad, it also summarizes the luminosity development of some and palladium. In order to overcome the limits of the traditional resin phase spectrophotometric method which has a lot of disadvantages in operation, this paper builds a new method called thin layer resin phase spectrophotometric method. The distinguishing features of this method is to form complex compound first by combining ion to be measured with colour reagent, then to exchange the same ion on the resin phase by different ways of combination, in this way do we produce the resin complex system, it ends with measuring elements in the longest wavelength by making thin resin. This method can be applied to the determination of the actual samples. For example , when using systems such as Fe( IE ) - SCN - , Fe ( II ) - phen, Fe( HI ) - sulfosalicylic acid , Fe ( IE ) -pyrogallic acid, Fe( HI) - EDTA,Fe( HI) ~ catechol and Fe( HI ) - phen, Fe( HI) ~ phen simultaneous determination mentioned in this paper to determine trace iron in several water samples , the result indicates that this method has high sensitivith and ideal precision, The determination result of the above systems is the following : Fe( H ) - phen system e = 1.12 X 104L-mol rcm"1)RSD = 3.2%;Fe(III) - SCN'system e = 8.4 x 104L-mol"x - cm" \ RSD = 4.3 % ; Fe( HI) - sulfosalicylic acid system e = 9. 38 x 104L-mor1-cm~1.RSD=4.8%; Fe( III)- EDTA system e= 1. 84 x 105 L-mor1-cm"1,RSD = 4.3% ; Fe( HI) - Catechel system e = 4.1 x 104and simultaneous determination system epe( n) - 8. 4 X 104L . mol . cm , eFe(m) = 2.5 x 104L. mol~l . cm~1, Compare with luminosity method , the sensitivity has been improved more than ten times , After investigating all influences to this method called by various factors , the best experimental conditions are finally fixed.This paper also mentions the actual measurement of phosphorus, cobalt, palladium tin in water samples , Using resin phosphorus molybdenum blue system to measure trace phosphorus in water samples , e = 9. 7 . 105L?mol"1 ?cm"1, RSD = 0.83%;Using Sn - SAF method to measure tin in water samples.The result reaches 8. 0 x 10~8mol. L-1 when measuring cobalt is. Using Bi( III) ~ KI system and Bi( HI) - Thio urea system simultaneously to measure trace bismuthin mineral samples, = 7.0 X 105L. mol~1 . cm"1, Co( ]] ) ~ Dimethylglyoxime system to measure the content of cobalt in medicine , = 1. 7 x 10 L, mol l' cm 1, it improves 14 times more sensitive than water phase spectrophotometric method .After comparing the above systems determination with the standard value of AAS method . We have found the result is quite satisfactory. The result shows that this method built in this paper assembles such features as seperation gathering and etermination together, so it overcomes the weakness of the traditional resin phase spectrophotometric method . We find it overcomes measare limits of atom absorption method compared with AAS method , it improves analysis accuracy and particularly, it should be applied to analysis of low content in environmetal water samples , low content of impurity in substances which are of high purity and complicated samples.