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Environmental Analysis Laboratory

Acid sulfate soil and rock

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T: (02) 6620 3678
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EAL offers comprehensive acid sulfate soil and rock testing at competitive prices (pdf) for home, recreational, civil commercial, industrial and agricultural applications. EAL has been involved in research and method development for the identification and management of these soils for more than 15 years. EAL routinely performs screening, risk assessment and validation techniques using acid base accounting.

There are two main suites of soil testing available:

  • Chromium Suite (AS-PACK-008), and
  • Suspension Peroxide Oxidisable Combined Acidity and Sulfur (SPOCAS) Suite (AS-PACK-005).

The Chromium Suite is the preferred technique. Unlike the SPOCAS Suite, it does not suffer from interferences due to organic matter and sulfate minerals. The Chromium Suite is also the preferred method when the sulfide content is close the action limit of 0.03%. When the SPOCAS Suite is used results should be checked against Chromium Suite data for 15% of analyses (Ahern et al. 2004). Further discussion of the two suites (pdf) can be accessed from the download page.

Acid rock testing uses a combination of Net Acid Producing Potential (NAPP) and Net Acid Generation (NAG) techniques for screening acid rock material. EAL offers two alternatives for quantification of sulfur for Maximum Potential Acidity (MPA):

  • Acid sulfate rock (AS-PACK-006) using LECO total sulfur, and
  • Acid sulfate rock (AS-PACK-010) using Chromium Reducible Sulfur (CRS).

Adhering to standard sample collection and preservation procedures (pdf) ensures the highest level of accuracy. Soil sampling guides for New South Wales (pdf), Queensland (pdf) and Western Australia (pdf) are available to assist in planning a soil sampling program.

EAL can provide qualified staff to undertake on-site sampling at a base rate of $110 excl. GST. Please contact EAL for more information.

Reference: Ahern CR, McElnea AE, Sullivan LA. 2004. Acid sulfate soils laboratory methods guidelines. Queensland Department of Natural Resources, Mines and Energy: Indooroopilly, Qld Australia.