[Code of Federal Regulations]

[Title 40, Volume 16]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR80.56]



[Page 664]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 80_REGULATION OF FUELS AND FUEL ADDITIVES--Table of Contents

 

                     Subpart D_Reformulated Gasoline

 

Sec.  80.56  Measurement methods for formaldehyde and acetaldehyde.



    (a) Formaldehyde and acetaldehyde will be measured by drawing 

exhaust samples from heated lines through either 2,4-

Dinitrophenylhydrazine (DNPH) impregnated cartridges or impingers filled 

with solutions of DNPH in acetonitrile (ACN) as described in Sec. Sec.  

86.109 and 86.140 of this chapter for formaldehyde analysis. Diluted 

exhaust sample volumes must be at least 15 L for impingers containing 20 

ml of absorbing solution (using more absorbing solution in the impinger 

requires proportionally more gas sample to be taken) and at least 4 L 

for cartridges. As required in Sec.  86.109 of this chapter, two 

impingers or cartridges must be connected in series to detect 

breakthrough of the first impinger or cartridge.

    (b) In addition, sufficient sample must be drawn through the 

collecting cartridges or impingers so that the measured quantity of 

aldehyde is sufficiently greater than the minimum limit of quantitation 

of the test method for at least a portion of the exhaust test procedure. 

The limit of quantitation is determined using the technique defined in 

Sec.  80.55(d).

    (c) Each of the impinger samples are quantitatively transferred to a 

25 mL volumetric flask (5 mL more than the sample impinger volume) and 

brought to volume with ACN. The cartridge samples are eluted in reversed 

direction by gravity feed with 6mL of ACN. The eluate is collected in a 

graduated test tube and made up to the 5mL mark with ACN. Both the 

impinger and cartridge samples must be analyzed by HPLC without 

additional sample preparation.

    (d) The analysis of the aldehyde derivatives collected is 

accomplished with a high performance liquid chromatograph (HPLC). 

Standards consisting of the hydrazone derivative of formaldehyde and 

acetaldehyde are used to determine the response, repeatability, and 

limit of quantitation of the HPLC method chosen for acetaldehyde and 

formaldehyde.

    (e) Other sampling and analytical techniques will be allowed if they 

can be proven to have equal specificity and equal or better limits of 

quantitation. Data from alternative methods that can be demonstrated to 

have equivalent or superior limits of detection, precision, and accuracy 

may be accepted by the Administrator with individual prior approval.