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.
definition - tierra helada. Tierra helada. Tierra helada (Spanish for frozen land) is a term used in Latin America to refer to the highest places found within the Andes mountains. Tierra helada is for the Montane grasslands and shrublands, Sunis, Punas and Paramos between the Treeline and the Snow line. The term Tierra nevada is accurate from a climatological standpoint, as its land is indeed frozen, situated above the snow line.