Aqua Regia and HCl Metal Concentrations in Antarctic Permeable Reactive Barrier Media

Antarctic data from the Casey Main Power House site contains analytical results from aqua regia digestions and 1 M HCl acid extractions on permeable reactive barrier (PRB) media samples. The dataset comprises four Excel files of ICP-OES analysis results, measuring element concentrations. It was produced by the Australian Antarctic Division (AU_AADC) and last updated in January 2014.

Use Cases

• Compare total metal content (from aqua regia digestion columns) against bioavailable/labile metal fractions (from 1 M HCl extraction columns) for PRB media.
• Assess purity of different iron source materials (Peerless, Connelly, Chem-Supply) using concentration data from aqua regia digestions.
• Analyze element-specific concentrations (e.g., phosphorus, potassium) determined by ICP-OES to evaluate PRB media performance over time.
• Validate analytical methods by referencing limit of quantification (LOQ) data and certified reference material results included in the files.

Strengths

• Analytical results include both total digestible (aqua regia) and labile/bioavailable (1 M HCl) metal fractions for direct comparison.
• Quality control measures are documented, including use of certified reference materials, internal standards (yttrium), and blank samples.
• Samples were collected from a specific depth range (45-60 cm) and stored at -18°C to preserve integrity.

Limitations

• The dataset's size, row count, and specific column names are unknown, limiting preliminary assessment.
• Data is temporally stale, with the last update in 2014 and sampling from a 2012/13 field season.
• Sample size for media cores is small, with only eight cores taken (three in GAC/ZeoPro, three in ZVI/sand, two in zeolite).

Provenance

Source

Australian Antarctic Division (AU_AADC), accessed via NASA Earthdata.

Collection Method

Inductively coupled plasma-optical emission spectroscopy (ICP-OES) analysis following standardized aqua regia digestion and 1 M HCl extraction protocols on cored PRB media samples.

Time Range

Sampling occurred during the 2012/13 Antarctic field season; media was replaced on 16 January 2013.

Freshness

2014-01-09

Geography

Casey Main Power House, Antarctica.