Effects of conservation methods of water samples on determination of total phosphorus were analyzed from aspects of methods of adding conserving agent, SS concentration, natural sedimentation time, conservation temper...Effects of conservation methods of water samples on determination of total phosphorus were analyzed from aspects of methods of adding conserving agent, SS concentration, natural sedimentation time, conservation temperature and time. The results showed that SS concentration in water and natural sedimentation time had the greatest impact on the determination of total phosphorus, while the influence of methods of adding conserving agent, conservation temperature and time was relatively smaller. TP concentration in water samples conserved irregularly was higher than the standard value due to the existence of SS and microorganisms in water, and the deviation became larger with the increase of SS concentration in water. In addition, quality control measures and matters needing attention during the conservation process of water samples were put forward to improve the accuracy of TP concentration.展开更多
针对当前湿地环境监测工作耗时耗力、安全系数低、成本高和采样难度大的问题,提出基于STC89C52RC和HC-12的无人船湿地环境监测系统。系统以STC89C52RC单片机为主控单元,使用便携式移动电源供电,通过导线连接由nRF905无线通信模块、HC-1...针对当前湿地环境监测工作耗时耗力、安全系数低、成本高和采样难度大的问题,提出基于STC89C52RC和HC-12的无人船湿地环境监测系统。系统以STC89C52RC单片机为主控单元,使用便携式移动电源供电,通过导线连接由nRF905无线通信模块、HC-12无线通信模块、电机驱动系统、舵机驱动系统、水样采集系统、全球定位系统(global position system,GPS)和水质指标监测系统等构成的湿地环境监测无人船系统硬件部分,通过串口分别连接和烧写使用C#、keil软件制作上位机程序与nRF905单片机驱动程序,实现计算机通过串口通信方式完成单片机之间的无线通信和AT指令集的收发,从而达成计算机远距离实时遥控无人船进行定点水样采集与pH、浊度、温度指标监测的目的。野外实验结果证明,系统运行稳定,且水质指标测定结果精准。展开更多
文摘Effects of conservation methods of water samples on determination of total phosphorus were analyzed from aspects of methods of adding conserving agent, SS concentration, natural sedimentation time, conservation temperature and time. The results showed that SS concentration in water and natural sedimentation time had the greatest impact on the determination of total phosphorus, while the influence of methods of adding conserving agent, conservation temperature and time was relatively smaller. TP concentration in water samples conserved irregularly was higher than the standard value due to the existence of SS and microorganisms in water, and the deviation became larger with the increase of SS concentration in water. In addition, quality control measures and matters needing attention during the conservation process of water samples were put forward to improve the accuracy of TP concentration.
文摘针对当前湿地环境监测工作耗时耗力、安全系数低、成本高和采样难度大的问题,提出基于STC89C52RC和HC-12的无人船湿地环境监测系统。系统以STC89C52RC单片机为主控单元,使用便携式移动电源供电,通过导线连接由nRF905无线通信模块、HC-12无线通信模块、电机驱动系统、舵机驱动系统、水样采集系统、全球定位系统(global position system,GPS)和水质指标监测系统等构成的湿地环境监测无人船系统硬件部分,通过串口分别连接和烧写使用C#、keil软件制作上位机程序与nRF905单片机驱动程序,实现计算机通过串口通信方式完成单片机之间的无线通信和AT指令集的收发,从而达成计算机远距离实时遥控无人船进行定点水样采集与pH、浊度、温度指标监测的目的。野外实验结果证明,系统运行稳定,且水质指标测定结果精准。