Cdms (also known as the Cadmium Monitoring System) is a scientific instrument used to measure the concentration of cadmium in air, water, soil, and sediments. It was developed by the U.S. Environmental Protection Agency (EPA) and is currently operated by the National Oceanic and Atmospheric Administration (NOAA). The Cdms has been used extensively in research and monitoring programs to assess the environmental fate of cadmium and its potential effects on human health and ecosystems.
The Cdms consists of two main components: a sampler that collects air, water, or sediment samples; and a detector that measures the concentration of cadmium in the samples. The sampler is typically mounted on a tripod or other support structure, and can be operated manually or automatically. The detector is usually located in a laboratory, where it is connected to the sampler via a cable.
The Cdms uses an inductively coupled plasma-mass spectrometer (ICP-MS) to measure cadmium concentrations in samples. ICP-MS is a highly sensitive analytical technique that can detect trace levels of metals in complex matrices such as air, water, and soil. In addition to cadmium, the Cdms can also measure other metals such as lead and copper.
The Cdms has been used extensively in research studies investigating the global cycling of cadmium. These studies have helped to elucidate how this metal moves through different environmental media (such as air, water, soil, sediments) and how it affects human health and ecosystems. The data collected by the Cdms has also been used to develop models that predict exposure levels of people living near smelters or other sources of atmospheric emissions containing cadmium