2007
DOI: 10.1590/s0103-50532007000100022
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Ammonium ion sensor based on SiO2/ZrO2/phosphate-NH4+ composite for quantification of ammonium ions in natural waters

Abstract: Um eletrodo íon seletivo foi construído e avaliado para determinação de íons amônio em águas naturais. O eletrodo consiste de uma pasta de carbono com o compósito SiO 2 /ZrO 2 / fosfato-NH 4 + obtido pelo processo de sol-gel. O eletrodo exibe uma resposta sub-Nenstiana para concentrações entre 7,7×10-7 e 4,0×10 -2 mol L -1 e um limite de detecção de 1,58×10 -7 mol L -1 (8,5×10 -3 ppm). A resposta do eletrodo foi rápida (1 minuto). Os coeficientes de seletividade K pot A,B para os diversos íons geralmente prese… Show more

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Cited by 21 publications
(12 citation statements)
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“…Coutinho and co-workers published the analytical performances and applications of a GCE modified with SiO 2 /ZrO 2 / phosphate-NH 4 + composite. 100 This composite presented reproducible exchange properties toward NH 4 + in the pH range from 6 to 7.5, which may be an inconvenience for certain applications. In addition, again, the selectivity coefficient for K + did not improve the values as compared to those reported for electrodes analyzed in the earlier sections (see Table 3).…”
Section: Other Ammonium Electrodes Without Ionophoresmentioning
confidence: 99%
“…Coutinho and co-workers published the analytical performances and applications of a GCE modified with SiO 2 /ZrO 2 / phosphate-NH 4 + composite. 100 This composite presented reproducible exchange properties toward NH 4 + in the pH range from 6 to 7.5, which may be an inconvenience for certain applications. In addition, again, the selectivity coefficient for K + did not improve the values as compared to those reported for electrodes analyzed in the earlier sections (see Table 3).…”
Section: Other Ammonium Electrodes Without Ionophoresmentioning
confidence: 99%
“…Some of these state ranges and limits of detection that appear to outperform the current sensor. For instance, the potentiometric sensor based on SiO 2 /ZrO 2 /phosphate-NH 4 composite [15] had LOD of 0.158 μM and, thus, can be viewed as an exceptionally sensitive device. To prepare the SiO 2 / ZrO 2 /phosphate composite alone, however, a long-term (only incubation time totaled 55.5 h) and sophisticated multi step approach was used [17].…”
Section: Optimization Of the Working Buffer Parameters For The Clinopmentioning
confidence: 99%
“…Within the NH þ 4 -selective ISEs/sensors one may distinguish two main groups of materials used for the ammonium recognition predominantly. They are namely (1) organic and bioorganic polymers [9][10][11][12][13], and (2) inorganic crystalline solids [14][15][16]. Whereas the first group was pioneering in sensor application and has already contributed to a number of advantageous ammonium sensing devices, the materials of the second group still show vast potentialities and keep on raising interest for their exploration.…”
Section: Introductionmentioning
confidence: 99%
“…Various modifications of carbon paste were applied in potentiometric sensors for copper [286][287][288][289][290][291][292], silver [97, 153,293], mercury [94-296], lead [297], arsenic [97,298], antimony [299], bismuth [300], cobalt [301], osmium [302], aluminium [107], lithium [303], ammonium [304], halides and pseudo-halides [305][306][307][308], and sulphate ions [309]. Some of them [97,302] were applied to monitor titrations based on ion-pair formation principles described and discussed in detail previously [310].…”
Section: Carbon Paste-based Ion-selective Electrodes (Cp-ises)mentioning
confidence: 99%