A H 2 SO 4 5 mol L-1 solution was sprayed on the surface of each sample, to avoid NH 3 volatilization, and the soil dried in a forced-air oven (40 ºC/72 h) for posterior analysis by mass spectrometry ...

PLC远程控制系统在许多领域都有广泛的应用。以下是一些PLC远程控制系统的应用案例： （1）变电站监控：在电力系统中，PLC被用于变电站的监控和控制。通过PLC远程控制系统，可以实时监控变电站的运行状态，包括电流、电压、温度等参数，并可以实现远程 ...

Sub-samples were used for total N and N abundance evaluations by mass spectrometry in an automated continuous flow Mass Spectrometer, Model ANCA-SL (Europa Scientific ... Universidade de São Paulo, ...