H-Point Standard Addition Methods

In the context of the voltammetry of microparticles methodology, the H-point standard addition method has been adapted for determining organic dyes [241] as well as lead and tin in ceramics [242]. Let us consider a mixture of material containing unknown amounts of two electroactive compounds, A and B, and a reference compound, R. It is assumed that weighted amounts of both materials are accurately powdered and thoroughly mixed so that the mass ratio between the A,B-containing material and the reference compound, m/mR, is known. 

Table 41 Application of the H-point standard addition method to a mixture of a commercial madder pigment (Kremer, 0.03325 g) plus silica (0.25836 g) and moiin (0.02486 g), this last acting as an auxiliary reference compound... 

Table 4.2 Statistical parameters for H-point standard addition method apphed to commercial madder pigment using silica as a diluent and morin as a reference compound...

Data in Table 4.2 corresponds to the application of the H-point standard addition method to a mixture of a commercial madder pigment diluted with silica, using morin as a reference compound. Calculations were performed by taking m/niR = 10.246, using square-wave voltammetric currents measured for sample-modified PIGEs in contact with an acetate buffer of pH 4.90. Linear plots of ii/ip(R) (squares) and i2/ip(R) (solid squares) vs. mA/mp for additions of purpurin are shown in Fig. 4.17. 

Table 4.3 Comparison of the percentages of Sn and Pb calculated upon apphcation of the H-point standard addition method to three commercial ceramic frits (F-1 to F-3) and an archaeological sample (A-1)—a medieval glazed piece produced in the second half of the 15th century in Manises (Valencia, Spain)...

Campins P, Bosch F, Verdu J, Molins C (1994) Study of the behaviour of the absorbent blanks in analytical procedures by using the H-point standard additions method (HPSAM). Talanta 41 39-52. 

Campins P, Verdu J, Bosch F (1994) Development of the H-point standard additions method for the use of spectrofluoiimetry and synchronous spectrofluoiimetry. Analyst 119 2123-2128. 

Shams E, Abdollahi H, Yekehtaz M, Hajian R (2004) H-point standard additions method in the analysis by differential pulse anodic stripping voltammetry Simultaneous determination of lead and thin.Talanta 63 359-364. 

Bosch F, Domenech A, Domenech-Carbo MT, Gimeno JV (2007) H-point standard addition method applied to voltammetry of microparticles. Quantitation of dyes in pictorial samples. Electroanalysis 19 1575-1584. 

Homoaerothionin, biosynthesis of 1315, 1316 HomocaUxarenes, synthesis of 1376-1381 Homoerysodienones, formation of 1297 B-Homoerythrina alkaloids 1297 synthesis of 1300 Honey, analysis of 961, 973 Horseradish peroxidase 974, 977, 978, 981 as oxidation catalyst 1216, 1217, 1219-1221, 1224, 1225 HPLC, normal phase 953 H-point standard additions method 954 HSZ-360 catalyst 680 Hydrocarbons, aromatic,... 

Domenech, A., Domenech, M.T., Gimeno, J.V., and Bosch, R 2006a. H-point standard addition method applied to solid state stripping voltammetry. Application to the determination of lead and tin in archaeological glazes. Analytical and Bioanalytical Chemistry 385, 1552-1561. 

A chemometric method for simultaneous determination of calcium and magnesium in natural waters using Arsenazo III and FIA system was described [5], The concentrations of the analytes were calculated by the H-point standard addition method for ternary mixtures. 

An analysis of scientific articles shows new trends in the use of derivative sp>ectrophotometiy. First direction of development is a combination of derivative sp>ectra with chemometiic methods [28, 36, 39, 42]. Procedures based on derivatisation of ratio sp>ectra [24, 25,28, 30, 40, 44, 47] belong to the same group. An interesting modification of derivative sp>ectrophotometric ptrooedure described Eskandari [48]. A fusion of H-point standard addition method with the first derivative of mixture spiectra was applied for simultaneous determination pjalladium and cobalt. The method was applied for their determination in synthetic mixtures and alloys. 

Bosch-Reigh, F., Campins-Falco, P., SeviUano-Cabeza, A, Herraes-Hemandez, R., Molins-Legua C. (1991). Development of the H-Point Standard Addition Method for Ultraviolet-Visible Sp>ectroscopic Kinetic Analysis of Two-comp>onent Systems, Analytical Chemistry, Vol.63, No.21, pp. 2424-2429 Burnius, E. (1959). Assay of Vitamin A Oils, Journal of the American Oil Chemistry s Society, Vol.35, No.4, pp. 13-14... 

Tartrazine and Quinoline Yellow as Cr(III) complexes in a Tween-80 micellar medium were simultaneously determined using an H-point standard addition method [30]. The method proposed is based on the complexation of the food dyes with potassium chromate or Cr(III) as complexing agent at pH 6.0 and solubilizing the complexes in Tween-80 micellar media. Tartrazine and Quinoline Yellow can be determined simultaneously in the concentration ranges 2.67-12.0 and 0.954-2.39 J.g/mL, respectively. This method has been applied for the determination of Tartrazine and Quinoline Yellow in mango flavor with satisfactory results. 

Amandeep, K. and G. Usha. 2012. Simultaneous determination of binary mixtures of Tartrazine and Quinoline Yellow food colorants in various food samples and cosmetic products in micellar media by H-Point Standard Addition Method (HPSAM). Int.J. Res. Chem. Environ. 2(l) 293-300. 

Afkhami A, Zarei AR (2004) Simultaneous spectrophotometric determination of hydrazine and phenylhydrazine based on their condensation reactions with different aromatic aldehydes in micellar media using H-point standard addition method. Talanta 62 559-565... 

---