| http://www.w3.org/ns/prov#value | - The type of instruments may include pH probes, ORP probes, density measurement instruments, ultrasonic attenuation, conductivity, zeta potential, transmission spectroscopy, absorption spectroscopy, turbidimetry, nephelometry, near-infra red NIR, or other spectroscopic technique allowing a single chemical species of interest to be isolated and related to a chemical concentration within a solvent.
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