How to Test for Cadmium in Soil with XRF
Cadmium doesn't get the same attention as lead or arsenic in most soil investigations.
But at the right site types, it's a serious contaminant - one that creates human exposure pathways that make it worth understanding before you mobilize.
Here's what makes cadmium different from most heavy metals. It easily transfers from soil into food crops, which means agricultural land with high levels of cadmium creates a direct human exposure route. Even at concentrations that don't meet industrial site cleanup standards.
That's a problem that carries real public health weight.
Where Does Cadmium Come From in Soil?
The most significant industrial source is zinc smelting. Cadmium is a byproduct of zinc production and historically deposited around zinc processing facilities. Other sources include
- Battery Manufacturing
- Cadmium Plating Operations
- Pigment Production
- Phosphate Fertilizers
- Sewage Sludge
Now here's the honest part about XRF and cadmium: it's one of the more challenging elements for field XRF in soil. Cadmium has a relatively weak XRF signal, and its characteristic X-ray energy can overlap with interferences in complex soil matrices. Detection limits for cadmium in soil by field XRF typically run 5 to 20 mg/kg depending on instrument, measurement time, and soil composition.
Where XRF earns its place in cadmium investigations is at industrially impacted sites with substantially elevated concentrations, like zinc smelter properties, battery facility sites, and former plating operations, where concentrations are well above detection limits and the key question is spatial extent. Scan the site, find the hot spots, target your laboratory samples where they actually matter.
Know where field XRF fits in your cadmium investigation before you mobilize.
Shop handheld Soil Testing XRF analyzers at Alloy Geek
More XRF Resources for Soil Testing
There are a lot of ways to save money and time with XRF analysis, especially in industries that need perform soil testing. Learn more about the uses and benefits of XRF analysis for your business from an XRF professional.