Resumen

CAPOTE L, TarcisioJ; MATUTE P, Saida B  y  ROJAS V, Jesús R. Total hardness water determination by EDTA using a olorless buffer borate. INHRR [online]. 2015, vol.46, n.1-2, pp.25-37. ISSN 0798-0477.

Total Hardness determination EDTA in water using ammonium buffer solution pH 10 has the disadvantage of generating ammonia gas vapors are usually upset or be potentially harmful to the respiratory system operator. The aim of this study was to use a buffer solution pH 10 borate odorless replacing ammonium buffer solution at pH 10 for the determination of total water hardness in the methodology of COVENIN 2408-86 standard and determine whether there was difference statistically significant between the two procedures. Total Hardness was determined using borate buffer odorless in 13 water samples with different degrees of hardness (soft, hard and very hard); the results obtained were compared with the reference method values. The buffer allowed rapid and sharp display of the end point during the execution of the volumetric determination, the results showed that there was no statistically significant difference (p≤ 0,05) in hardness values by using two buffers. It was concluded that the use of borate buffer odorless for quantification of total hardness water is an alternative to the ammonium buffer.

Palabras clave : Water analysis; Water Quality; Total hardness in water; calcium ions; magnesium ions; buffer olorless; borate buffer.

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