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    • 8. 发明授权
    • Apparatus and method for in situ pH measurement of aqueous medium
    • 水介质原位pH测量仪器及方法
    • US5925572A
    • 1999-07-20
    • US907324
    • 1997-08-06
    • Robert H. ByrneRobert D. WaterburyJohn J. KellyBram LeaderRandy RussellCharles W. JonesJoseph R. KolesarSean McElligott
    • Robert H. ByrneRobert D. WaterburyJohn J. KellyBram LeaderRandy RussellCharles W. JonesJoseph R. KolesarSean McElligott
    • G01N21/27G01N21/80G01N21/00
    • G01N21/272
    • A pH sensor based upon spectrophotometric techniques has been developed for in situ analysis of an aqueous medium, e.g., surface seawater. This sensor utilizes a spectrophotometric pH indicator (Thymol Blue), which has been calibrated for use in seawater as a function of temperature and salinity. Shipboard spectrophotometric pH analyses routinely demonstrate a precision on the order of .+-.0.0004 pH units. In situ analysis of seawater pH has demonstrated a precision on the order of .+-.0.001 and an accuracy, using shipboard measurements as a standard, on the order of .+-.0.01. The sensor is a self-contained system that pumps seawater, meters in indicator, and spectrophotometrically determines indicator absorbance cells, each with three wavelength channels, to obtain the spectrophotometric absorbance. The sensor system, rated for depths up to 500 m, provides pH, conductivity, and temperature and can be operated via computer or in a standalone mode with internal data storage. The sensor utilizes less than 12 watts of power and is packaged in an aluminum housing.
    • 已经开发了基于分光光度技术的pH传感器用于水性介质例如表面海水的原位分析。 该传感器使用分光光度计pH指示剂(百里酚蓝),其已经被校准用于海水,作为温度和盐度的函数。 船用分光光度计pH值分析通常显示±0.0004个pH单位的精度。 海水pH值的原位分析表明,使用船上测量作为标准,精度为+/- 0.001,精度为+/- 0.01。 该传感器是一个独立的系统,用于泵送海水,仪表在指示器中,分光光度法测定每个具有三个波长通道的指示剂吸光度单元,以获得分光光度吸光度。 传感器系统的深度达500米,提供pH,电导率和温度,可通过计算机或独立模式进行内部数据存储。 该传感器使用的功率小于12瓦,并封装在铝外壳中。