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Published: 2017 - 07 - 15
Directional power meters are used to measure power and reflection under operational conditions. They are connected between source and load and measure the power flow in both directions. The power applied to the load and the reflection can thus be measured. Typical applications are in installation, maintenance and monitoring of amplifiers, transmitters, antennas and RF/microwave generators in industrial and medical fields.
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The Ministry of Environmental Protection has issued six standards for liquid chromatography, ion chr

Date: 2016-06-27
Views: 192

Recently, the Ministry of Environmental Protection issued six national environmental protection standards, such as the determination of silver nitrate capacity for fixed source of waste gas, and the instrumentation methods for ion chromatography and liquid chromatography. The six standards issued this time will be implemented on August 1, 2016. The first three items are revised and the last three items are released for the first time.

    The standard name and number are as follows:

    I. Determination of Hydrogen Chloride from Fixed Pollution Sources, Method for Determination of Silver Nitrate Capacity (HJ548-2016);

    This standard specifies the silver nitrate volumetric method for the determination of hydrogen chloride in fixed source exhaust gas. This standard is a revision of the 'Measurement of Silver Nitrate Capacity for Hydrogen Chloride from Fixed Sources (Interim)' (HJ548-2009). This standard was first published in 2009, and the original standard drafting unit was the Beijing Environmental Protection Monitoring Center.

    2. Determination of Hydrogen Chloride in Ambient Air and Exhaust Ion Chromatography (HJ549-2016);

    This standard specifies ion chromatography for the determination of hydrogen chloride in ambient air and exhaust gases. This standard is a revision of the 'Ion Chromatography for the Determination of Hydrogen Chloride in Ambient Air and Exhaust Gas (Provisional)' (HJ549-2009). This standard was first published in 2009, and the original standard drafting unit was the Beijing Environmental Protection Monitoring Center.

    3. 'Determination of water quality chlorine dioxide and chlorite by continuous titration of iodometry' (HJ551-2016);

    This standard specifies the continuous titration of iodometric method for the determination of chlorine dioxide and chlorite in textile dyeing and finishing industrial wastewater. This standard is a revision of the 'Iodine Determination of Water Quality Chlorine Dioxide (Provisional)' (HJ551-2009). This standard was first published in 2009, and the original standard drafting unit was the Beijing Environmental Protection Monitoring Center.

    4. Determination of water-soluble anions (F-, Cl-, Br-, NO2-, NO3-, PO43-, SO32-, SO42-) in ambient air particulates by ion chromatography (HJ799-2016);

    This standard specifies eight kinds of water-soluble anions (F-, Cl-, Br-, NO2-, NO3-, PO43-, SO32-, SO42-) in the determination of ambient air particles (TSP, PM10, PM2.5, dust reduction, etc.). Ion chromatography. This standard is the first release.

    V. Determination of Water-Soluble Cations (Li+, Na+, NH4+, K+, Ca2+, Mg2+) in Environmental Air Particles by Ion Chromatography (HJ800-2016);

    This standard specifies ion chromatography for the determination of six water-soluble cations (Li+, Na+, NH4+, K+, Ca2+, Mg2+) in ambient airborne particulate matter (TSP, PM10, PM2.5, dust reduction, etc.). This standard is the first release.

    6. Determination of Ambient Air and Waste Gases Amide Compounds by Liquid Chromatography (HJ801-2016).

    This standard specifies liquid chromatography for the determination of amides in ambient air and fixed source exhaust gases. This standard is the first release.

    From the date of implementation of the above standards, the following national environmental protection standards are abolished. The standard names and numbers are as follows:

    I. Determination of Hydrogen Chloride from Fixed Pollution Sources, Determination of Hydrogen Chloride Capacity (Interim) (HJ548-2009);

    2. Determination of Hydrogen Chloride in Ambient Air and Exhaust Gas Ion Chromatography (Provisional) (HJ549-2009);

    3. 'Iodine Determination of Water Quality of Chlorine Dioxide (Provisional)' (HJ551-2009).

(Source: Internet)


 

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