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As a routine part of laboratory practice, soil pH is commonly measured several months after sample collection. To determine the effect of sample storage time on soil pH, samples were analyzed the same day as collection, and in the laboratory at one, two, and six months after collection. The samples were collected as part of the Metals in the Environment (MITE) research at Rouyn–Noranda, Quebec. The pH of A-, B-, or C-horizon soils did not change with storage time, although the pH of humus was less acidic by 0.65 six months after collection. The pH of humus and A-horizon soils collected from sites underlain by clay are less acidic than sites underlain by till, whereas Band C-horizon samples have a similar pH for samples underlain by clay or till. In general soils become less acidic with depth. 1 Contribution to the Metals in the Environment Program 1 Resume : Communement, dans la pratique de laboratoire, on mesure le pH des sols plusieurs mois apres la collecte des echantillons. Afin de determiner l’effet du temps d’entreposage sur le pH des echantillons de sol, on a analyse des echantillons de sol le jour de la collecte, puis au laboratoire a des intervalles de un, deux et six mois apres la collecte des echantillons. Les echantillons avaient ete recueillis a Rouyn-Noranda (Quebec) dans le cadre de la recherche sur les metaux dans l’environnement (MEDE). Le pH des horizons A, B ou C des sols n’a pas varie avec le temps, mais le pH de l’humus etait devenu de 0,65 unites de pH moins acide six mois apres la collecte. Le pH de l’humus et des echantillons d’horizons A de sol recueillis a des sites dont le sous-sol est constitue d’argile, est moins acide que celui des echantillons provenant de sites dont le sous-sol est constitue de till. La composition du materiau sous-jacent n’influence pas le pH des echantillons des horizons B et C. En general, les sols deviennent moins acides a mesure que la profondeur augmente.

Some observations on the effects of length of sample storage, sample type, and sample depth on the determination of pH in soils collected in the vicinity of the Horne smelter at Rouyn-Noranda, Quebec