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During and after a fire, changes occur in soil properties, including pH, which affects the solubility and availability of nutrients. Currently, there is a great diversity of protocols, some involving normalized standards, to determine soil pH, but there is no consensual or universal analytical method for this parameter, especially in burned soils, in which mineral and organic fractions could have been modified. Therefore, the objective of the present work is to evaluate the effect that variations in these analytical protocols may have on pH results. For this, five methods commonly found in the international bibliography for the analysis of pH of soil in water (pHH2O) were selected and compared to propose the most precise procedure. The analytical methods were applied to 43 soil samples, collected in a plot subjected to prescribed burning in the Parque Natural de Montesinho (Northern Portugal). The studied methods differ in the following protocol items: water suspension ratio (1:2.5 or 1:5), mechanical stirring time in the suspension (10 min or 1 h), and in the resting time for the solid particles to settle (15 min or 8 h). The obtained results point to the suitability of the five methods used for soil pH analysis, indicating that there are no statistically significant differences. However, results also allow suggesting a more appropriate method concerning practical reasons, such as labor in a lab. Thus, to make the analysis process more profitable, M2 is a good option because it uses a small amount of sample (5 g), short agitation (10 min) and settling time (15 min). In turn, M1 and M5, which use a lower proportion of soil (1:2.5) show lower pH variation in the measurements. This fact may be explained by a smaller dilution effect. Considering that these two methods differ in the settling time, it is suggested to apply M1, because only 15 min are required. Therefore, the main conclusion reached with this work is that the measurement of soil pH using M1, i.e., a soil:water ratio of 1:2.5, with agitation of 10 min and settling time of 15 min, is a robust and more expeditious protocol to be applied to soil samples after a fire.<\/jats:p>","DOI":"10.3390\/fire6060227","type":"journal-article","created":{"date-parts":[[2023,6,7]],"date-time":"2023-06-07T01:38:41Z","timestamp":1686101921000},"page":"227","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["A Comparison of Analytical Methods for the Determination of Soil pH: Case Study on Burned Soils in Northern Portugal"],"prefix":"10.3390","volume":"6","author":[{"given":"Maria","family":"Faria","sequence":"first","affiliation":[{"name":"ICT\u2014Institute of Earth Sciences, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5744-8530","authenticated-orcid":false,"given":"Tamires","family":"Bertocco","sequence":"additional","affiliation":[{"name":"ICT\u2014Institute of Earth Sciences, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"given":"Ana","family":"Barroso","sequence":"additional","affiliation":[{"name":"ICT\u2014Institute of Earth Sciences, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3565-4496","authenticated-orcid":false,"given":"Manuela","family":"Carvalho","sequence":"additional","affiliation":[{"name":"REQUIMTE\/LAQV, Polytechnic of Porto\u2014School of Engineering (ISEP), 4249-015 Porto, Portugal"}]},{"given":"Felicia","family":"Fonseca","sequence":"additional","affiliation":[{"name":"CIMO\u2014Centro de Investiga\u00e7\u00e3o de Montanha, Instituto Polit\u00e9cnico de Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"},{"name":"SusTEC\u2014Laborat\u00f3rio Associado para a Sustentabilidade e Tecnologia em Regi\u00f5es de Montanha, Instituto Polit\u00e9cnico de Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3924-776X","authenticated-orcid":false,"given":"Cristina","family":"Delerue Matos","sequence":"additional","affiliation":[{"name":"REQUIMTE\/LAQV, Polytechnic of Porto\u2014School of Engineering (ISEP), 4249-015 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7690-8996","authenticated-orcid":false,"given":"Tom\u00e1s","family":"Figueiredo","sequence":"additional","affiliation":[{"name":"CIMO\u2014Centro de Investiga\u00e7\u00e3o de Montanha, Instituto Polit\u00e9cnico de Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"},{"name":"SusTEC\u2014Laborat\u00f3rio Associado para a Sustentabilidade e Tecnologia em Regi\u00f5es de Montanha, Instituto Polit\u00e9cnico de Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"}]},{"given":"Am\u00e1lia","family":"Sequeira Braga","sequence":"additional","affiliation":[{"name":"ICT\u2014Institute of Earth Sciences, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7293-3825","authenticated-orcid":false,"given":"Teresa","family":"Valente","sequence":"additional","affiliation":[{"name":"ICT\u2014Institute of Earth Sciences, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4048-0892","authenticated-orcid":false,"given":"Raimundo","family":"Jim\u00e9nez-Ballesta","sequence":"additional","affiliation":[{"name":"Department of Geology & Geochemistry, Autonoma University of Madrid, 28049 Madrid, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2023,6,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1350","DOI":"10.2136\/sssaj2017.04.0119","article-title":"Development of a Spectrophotometric Method for Determining pH of Soil Extracts and Comparison with Glass Electrode Measurements","volume":"81","author":"Bargrizan","year":"2017","journal-title":"Soil Sci. 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