Please contact the technical staff before shipping instruments or standards to the address listed below.
National Institute of Standards and Technology
100 Bureau Drive, Stop 8393
Gaithersburg, MD 20899-8393
|Service ID Number||Description of Services||Fee ($)|
|37540C||Certification of Mercury Calibration Gas Generator||7666|
Fees are subject to change without notice.
Certification of Mercury Calibration Gas Generator (37540C)
The measurement method established to provide field traceability o fmercury continuous emission monitors (CEMs) to the International System of Units (SI) is as follows: NIST will quantify the output of a mercury calibration gas generator maintained at NIST as the NIST Prime generator. The NIST Prime generator and a mercury detector are used to quantify mercury calibration gas generators submitted to NIST by vendors for certification(Vendor Prime generator). The NIST Prime generator is certified at specific settings over a range of (0.2 to 39) µg/m3 for the low level NIST Prime generator, and from (40 to 300) µg/m3 for the high level NIST Prime generator. The Vendor Prime is returned to the vendor with its gas delivery certified at specific concentration points chosen by the vendor. The certified generator is used to establish traceability for the manufactured mercury CEMs. The primary measurement method used for establishing the certification of the NIST Prime generator as the transfer standard for the NIST traceability protocol, is an isotope dilution method using cold-vapor generation inductively coupled plasma mass spectrometry(ID-CV-PCP-MS).