New analytical method for the measurement of sub ppb levels of inorganic arsenic in drinking water and fruit juices by HG/GC/PID

PAPER ID: 2385175 
PAPER TITLE: New analytical method for the measurement of sub ppb levels of inorganic arsenic in drinking water and fruit juices by HG/GC/PID (final paper number: ANYL 87)

DIVISION: Division of Analytical Chemistry
SESSION: Analytical Division Poster Session
SESSION TIME: 7pm-9pm

PRESENTATION FORMAT: Poster
DAY & TIME OF PRESENTATION:
ROOM & LOCATION: Hall D - San Diego Convention Center 

AUTHORS (FIRST NAME, LAST NAME): John N. Driscoll2, Jennifer L. Maclachlan1

Joseph Sabol3 INSTITUTIONS (ALL): 1. PID Analyzers, LLC, Centerville, MA, United States.  2. PID Analyzers, LLC, Sandwich, MA, 3. Chemical Consultant, Racine, WI United States.

ABSTRACT BODY:  Abstract: Cutter and others (1) described Hydride Generation (HG) with Gas Chromatography (GC)/Photoionization Detector (PID) with a liquid nitrogen concentrator more than twenty-five years ago for part per billion (ppb) detection of metalloids such as As, Sb and Se, in natural waters. These early papers on HG/GC/PID (1 ) used a liquid nitrogen trap to collect the AsH3 from the hydride generator. The trap was heated to drive off the concentrated AsH3 sample into the GC. Cutter (2) has continued his work on the analysis of As in natural waters with GC/PID and is able to detect 0.75 parts per trillion (ppt) of As. An additional advantage of this PID method is that it could also be used to detect organoarsenic compounds. Driscoll and Maclachlan described a modified HG/GC/PID method for the analysis of ppb levels of arsenic in drinking water and apple juice at the American Chemical Society meeting in New Orleans in 2013 (3). We have used that method and developed modifications and significant improvements including the elimination of the liquid nitrogen concentrator and detection of sub ppb levels of As. The advantages of the new HG/GC/PID analytical method are that it does not use liquid nitrogen, is easy to use, can determine inorganic arsenic (As+3 & As+5), does not require a high level of operator training and the capital cost is a fraction of Graphite Furnace Atomic Adsorption (GFAAS), or LC/ICP/MS system. This HG/GC/PID method will be described in detail in this paper. References: 1 Cutter LS, GA Cutter, San Diego McGlone, Anal Chem 63,1138 (1991) 2 Cutter, G. A., and Cutter, L. S. (2006). Biogeochemistry of arsenic and antimony in the North Pacific Ocean.Geochemistry, Geophysics, Geosystems, 7 (5), 3 Driscoll, JN and Jennifer MacLachlan, ACS National Meeting NOLA (2013), Division of Agriculture and Food Chemistry,Comparison of sensitive methods for the measurement of inorganic arsenic in apple juice: Photoionization (PID)and ICP-MS