Van Dorn water samplers are used in Crater Lake to collect water at eleven depths (surface, 5m, 10m, 20m, 60m, 100m, 200m, 300m, 400m, 500m, 550m). The lake is 574 meters deep at the sampling location. Usually, the lake is sampled once every summer month (July, August, and September). Water chemistry variables that are measured at each depth include dissolved oxygen, pH, alkalinity, conductivity, ammonia, nitrate, other nitrogen compounds, ortho-phosphate, total phosphorus, sulfate, chloride, calcium, magnesium, potassium, sodium, silicates, and iron.
Visit this page to learn more about Van Dorn samplers.