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.
From Wikipedia, the free encyclopedia. Tierra Helada (Spanish for frozen land), also known as Tierra Nevada (Spanish for snowy land), is a term used in Latin America to refer to the highest places found within the Andes mountains. The Tierra Helada comprises the montane grasslands and shrublands, sunis, punas and pÃ¡ramos between the tree line and the snow line. The term tierra helada is accurate from a climatological standpoint, as its land is indeed frozen, situated above the snow line. In the northern Andes, the latter is located at an altitude of approximately 15,000 ft (or about 4,500 m).