Detection of ammonia released from zeolite by the quantum cascade laser based photoacoustic set-up |
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| Authors: | M B Filho M G da Silva J C Polidoro F J Luna M BM Monte A Miklós F Souza-Barros H Vargas |
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| Institution: | (1) LCFIS, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, 2000, 28013-602 Campos dos Goytacazes, RJ, Brazil;(2) Embrapa Solos, Rio de Janeiro, RJ, Brazil;(3) LCQUI, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, 2000, 28013-602 Campos dos Goytacazes, RJ, Brazil;(4) Centro de Tecnologia Mineral, CETEM, Ilha da Cidade Universitaria, 21941-590 Rio de Janeiro, RJ, Brazil;(5) Instituto de Fsica, Universidade Federal do Rio de Janeiro, CP 68528, 21941-590 Rio de Janeiro, RJ, Brazil |
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| Abstract: | We report the first results obtained with a Brazilian
sedimentary zeolite (hereafter called the zeolite concentrate, ZC) to reduce
ammonia volatilization – loss of the nitrogen nutrient – in tropical
farms. Preliminary laboratory tests were made with both ammonium sulfate and
urea into ZC. The reported field tests – obtained in rose cultivations –
show a significant effect of the use of urea mixed with ZC on the stem
growth of the rose buds. In the laboratory tests, the observations of the
retention of ammonia by ZC were done using the photoacoustic set-up
described in this work. The report data were obtained at temperatures of 25
and 60°C, simulating typical tropical weather temperatures. |
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