Lab Analysis

Location - Lab Analysis - Risk Assessment - Schedule - Time Keeping

 

Following sampling, Magma Consulting began sample preparation for X-ray fluorescence (XRF) analysis. This involved drying and sieving all soil samples per the Sampling and Analysis Plan (see Work Plan for more details).

Dried soil samples

Sieve tower

After preparation, all samples underwent XRF analysis.

XRF analysis

Referencing Arizona's soil remediation standards, excessive concentrations of arsenic, manganese, and vanadium were found in the soil samples. Distributions of concentrations found for each chemical are presented below.

To determine the validity of the XRF analyses, a subset of samples were chosen to undergo inductively coupled plasma (ICP) analysis. How well the ICP and XRF results correlated would determine how fit all of the XRF results were for reporting purposes. A plot of the correlation can be seen below.

Unfortunately, the correlation was not strong, making the XRF results unfit for reporting purposes.
Despite this, risk assessments were completed per the Grading Instructor's request.