Determination of Cl^- and SO₄^2- in Boric Acid

Abstract:

Microcontents of Cl- and SO42- in boric acid were determined by photoelectricity turbidimetry with acid as medium. The effects of stabilizer, acidity of solution, content of precipitant, heating time and temperature as well as measuring time on the turbidity of the solution were studied. After above experiment parameters were optimized, in the measurements to determine SO42- in boric acid, the stabilizer was glycerine-ethanol (1:4), the precipitant was acidic BaCl2. The solution was shaked and heated, as a result, the adding sequence of reagents had no effects on results. The detection limit was 0.10mg/L, relative standard deviation (RSD) was less than 3%, recovery rate was 98.85%~103.00%, and measuring time last over 40min. SO^42- concentration in the range of 0.33 mg/L ~0.83mg/L showed a linear relationship with turbidity. In the determination of chlorine, the stabilizer was glycerine, measuring time held in 40min, detection limit was 0.03mg/L, RSD was less than 4%, and recovery rate was 102.2%~106.5%. Cl^- concentration in the range of 0.10 mg/L ~0.25mg/L showed a linear relationship with turbidity. Photoelectricity turbidimetry improve the precision and accuracy of the measurements. The method of turbidimetry to determine Cl^- and SO^42- in boric acid is simple, reliable, innocuous and applicable in practice.

• Periodical: Applied Mechanics and Materials (Volumes 152-154)
• Pages: 507-512
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.152-154.507
• Online since: January 2012
• Authors: Dian Ting Gong
• Keywords: Boric Acid, Chlorine, Spectrophotometry, Sulfate Radical, Turbidimetry

References

[1] S. D. Kumar, K. Venkatesh and B. Maiti: Chromatographia, 59 (1992), pp.243-245.

[2] S. Thangavel, K. Dash and S. M. Dhavile: submitted to Journal of Chromatography A, 1074(2005), pp.229-233.

[3] J. Hedrick, A. Gutlerrez and D. Potter The analysis of trace elements in boric acid by ICP-MS. Application Note, HEWLETT PACKARD, Printed in USA, (1997).

[4] P. Masson, F. Raemaeker and F. Bon: Accred Qual Assur, 10(2005), pp.439-443.

DOI: 10.1007/s00769-005-0026-3

[5] L. F. Capitán-vallvey, E. A. Guerrero and C. B. Merelo: Anal Bioanal Chem, 380(2004), pp.53-569.

[6] E. A. Pereira, A. Stevanato and A. A. Cardoso: Anal Bioanal Chem, 380(2004), pp.178-182.

[7] E. J. Hakoila, J. J. Kankare and T. Skarp: Analytical chemistry, Vol. 44 (1972), p.1857.

[8] S. M. B. Brienza, R. P. Sartini and N. J .A. Gomes: Analytica Chimica Acta, 308(1995), pp.269-274.

[9] D. Y. Sarica, N. Ertas: Turk J Chem, 25(2001), pp.305-310.

[10] N. Schmidt, M. Biesaga and A. Seubert: Microchim. Acta, 146(2004), pp.119-128.

[11] J. M. Irache, C. Durrer and G. Ponchel: submitted to International Journal of Pharmaceutics, Vol. 90 ( 1993), pp.9-12.

[12] China Standard Compile. Chemistry reagent-currency method about determination of sulfide. China Standard Press, (1988).

[13] B. DU, S. R. Wang and Q. WEI: submitted to Chinese Journal of Analytical Chemistry, 23(1995), pp.662-664.

[14] D. C. Rivard, L. A. Stricker and P. Neogi: submitted to Journal of Colloid and Interface Science, Vol. 149(1992), P. 521-527.

[15] J. R. Song, S. J. LIU and X. P Zhu: submitted to Journal of East China Geological Institute, Vol. 2 (2002), pp.154-158.

[16] A. E. Kaiser, A. L. Graham and L. A. Mondy: submitted to Journal of Non-Newtonian Fluid Mechanics, Vol. 2004, 16(2): 479-488.

DOI: 10.1016/j.jnnfm.2003.11.004