Electron capture detector (ECD). Electron capture detectors (ECD) are typically used in environmental testing for detecting PCBâs, organochlorine pesticides, herbicides and various halogenated hydrocarbons. With an electron capture detector, a beta emitter such as radioactive tritium or 63Ni is used to ionize the carrier gas.
Las Piedras: Las Piedras, city, southern Uruguay. It is situated in a wine-growing district just north of Montevideo. It was the site of a decisive battle (1811) in Uruguayâs struggle for independence, in which the revolutionaries defeated Spanish forces. Las Piedras is among the largest cities in Uruguay. It is known for its ostrich farming and horse racing. Las Piedras is on the main highway and railroad linking Montevideo with TacuarembÃ³ and Rivera. Pop.
If you like to hike, and can take a day or two, one of the best hiking and fishing destinations is along the Piedra River in Southwest Colorado. The Piedra starts in the Weminuche Wilderness. Three forks (the East and Middle Forks plus Williams Creek) travel to the south and merge into the main stem of the Piedra. The main river then travels southwest and south, mostly within the Piedra Wilderness.