By W. John Williams
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Extra resources for Handbook of Anion Determination
Investigation of interferences was restricted to species likely to be found in plant material, and indicated that Cu, Fe and Al have effect. The first two can be masked using thioglycollic acid. Aluminium is masked with citrate or oxalate. All three may be masked using EDTA. The reagent tends to hydrolyse, and requires storage in a refrigerator. Under such conditions its working life can be extended to 14 days. In a second 55 publication Basson, Pille and Du Preez reported the in situ preparation of the reagent in an automatic procedure.
30, 1406 (1958) 9. M A R T I N , J. R . and H A Y E S , J. R . , Analyt. , 24, 182 (1952) 10. British Standards 1121 : Part 49 (1966) London 11. , J. chem. Soc. Japan, pure Chem. , 82, 696 (1961); Analyt. , 9, 4103 (1962) 12. C A R L S O N , R . M . and P A Ú L . J . L . , Analyt. , 40, 1292 (1968) 13. M E L T O N , J . R V H O O V E R , w . L . and H O W A R D , P . A . , . / . Ass. off. analyt. , 52, 950 (1969) 14. E G N E U S , в. and U P P S T R O M , L . , Analytica chim. Acta, 66, 211 (1973) 15.
The apparatus itself is shown in 4 Figure 9. An outline procedure is given below. 1 g of C a C 0 3 when this step is omitted. A form of the method 5 capable of wide application is described by Pieters . Determination of carbonate using the Schroedter alkalimeter Procedure (a) Weigh the apparatus empty and again after introducing about 1 g of the sample into the lower chamber, and dilute HCl and concentrated H 2 S 0 4 into A and В respectively. (b) Open stopper below A to allow the HCl to enter the lower chamber, Carbonate and Bicarbonate 41 then close.