Sunday, September 25, 2011

A detailed study of VOC's in Groundwater Using an HNU Model PI101,#VOC's_in_Groundwater,#photoionization, #PID,#PID Analyzers,#EPA,Gr,#hazardous_Waste_site

This report describes a measurement of VOC's at a hazardous waste site using an HNU PI101 for headspace measurements.

PID and Ground Water Hs 870143441

The work was done with an HNU PI101 (photo below left. This instrument is no longer in production. It had been replaced with the Model 102 PID (below right)that has Snap On heads for interchangeable lamps or sensors.

Friday, September 23, 2011

Pd-H2 Nanotech Study with a Scanning Tunneling Microscope #nanotech, #Suffolk_Nanotech_Center,#SU_Science,#Pittcon

A study of H2 interaction with Pd nanoparticles via a Scanning Tunneling Microscope at the Suffolk University Nanotech Center. This was a joint effort of the Suffolk University Physics Dept. and PID Analyzers that was presented at the Pittsburgh conference in 2010. Pd-H2 Nano Tech Study With a Scanning Tunneling Microscope #nanotech, #Suffolk_Nanotech_Center,#SU_Science,... This is a photo of the 300A Pd particles with the valley between the particles showing some interaction with H2.

Saturday, September 17, 2011

EPA PID Detection and Site Characteristics of Dense Non Aqueous Phase Liquids #, EPA, #PID, #groundwater,#halogenated_hydrocarbons, #PID_117,#photoionization,#site_cleanup,#CCL4

This is a procedure for site cleanup of halogenated hydrocarbons that are non aqueous and not miscible with water. The detection device is the HNU Model PI101 photoionization analyzer.

PID Detection and Site Characterization of Dense Non Aqueous Phase Liquids (3)

A paper on the PID Model 102 with an 11.7 lamp was published previously and is described below:

Measurement of Chlorinated HC With an 117 PID

EPA PID Standard Operating Procedure 2114 #EPA,#PID,#Photoionization, #PID Analyzers, #HNU_101,#PID Analyzers

The purpose of this EPA Standard Operating Procedure
(SOP) is to describe a method for using a
photoionization detector (PID). The PID is a portable,
nonspecific, vapor/gas detector employing the
principle of photoionization to detect a variety of
chemical compounds, both organic and inorganic (hydrides,halogens... ) in
air. This procedure is applicable to the HNU PI-101,
HNU ISPI-101, and HW-101 used for air monitoring. The HNU 101 series has been replaced with the Model 102.

Epa Pid Sop Wmsr2114(4)

Tuesday, September 13, 2011

Evaluation of the PID Analyzers 102 for Leaking Underground Storage Tanks # EPA,#UST,#Leaking_ Underground _Storage_Tanks,#PID,#photoionization,# PID _Analyzers, #Model_102

Evaluation of the use of the PID Analyzers Model 102 for EPA's Leaking Underground Storage Tank (UST) Program is described in the report below:


EPA UST Website and Info on PID Model 102 Approval

Sunday, September 11, 2011

Sampling VOC's from Processes or Stacks with an IR Sensor

One of the most difficult problems in sampling from stacks is the removal of water vapor without losing the components to be measured. Methods for water removal include permeation driers, refrigeration, etc. These methods work well for removing water from stack gases with inorganic gases like NO, NO2 and SO2. For oxygenated VOC's, however, many of the oxygenated hydrocarbons like alcohols,  ketones, esters etc. are either miscible or moderately soluable in water. Gases which are soluable in water are carried through the nafion membrane and exhibit significant losses when passed through a Permapure drier. Water soluable gases can also be lost in refrigeration processes as well because of their solubility in water.

Therefore, a different method was employed for alcohols & ketones, namely heating the components above the dewpoint of the stack gas and making the measurement at an elevated temperature. Our IR sensors are temperature compensated up to 50C  so we used a heated & temperature controlled (+/- 2C) oven that housed the sensor and a coalescing microfiber filter. We calibrated the sensor at ambient and recalibrated at an operating temperature of 47C. The difference in calibration was < 5%.

A Photo of the Model 202 is shown below:

UST Tank Report with an HNU DL101 #UST, #Leaking_Underground_Storage_Tanks, #PID,#HNU,#Photoionization

This is a report on Leaking Underground Storage Tanks with an HNU DL101

UST Tank Report With HNU DL101 #UST, #Leaking_Underground_Storage_Tanks, #PID,#HNU,#Photoionization

The Model 102 and 102+ were described in a previous blog:

PID Model_102_Photoionization Analyzer 117 Lamp

Saturday, September 3, 2011

Headspace Vapor Screening of VOC’s in Soil with a PID #photoionization, # PID, #headspace,#Los_Alamos,#EPA,#VOC’s

This is a procedure for the measurement of VOC's in soil that was funded by the EPA. The analyzer used was the HNU Model 101 photoionization analyzer. This has been replaced by a newer Model 102.

Headspace Vapor Screening With a PID (Los Alamos)

Ethylene Oxide Monitoring via PID-GC #ETO_Monitoring, #EO_Monitoring,# Photoionization_GC,#PID_GC, #ETO_PEL

Ethylene Oxide (ETO) monitoring is described using photoionization detection following the separation by capillary GC (Model 301-C). The detection limit is in the low ppb (ideal for measuring PEL values of ETO) and the range can be expanded to 3,000 ppm so that stack levels can be measured at the same time as ambient with a multipoint sequencer.

Ethylene Oxide Monitoring