New Jersey Administrative Code
Title 7 - ENVIRONMENTAL PROTECTION
Chapter 27B - SAMPLING AND ANALYTICAL PROCEDURES
Subchapter 3 - AIR TEST METHOD 3: SAMPLING AND ANALYTICAL PROCEDURES FOR THE DETERMINATION OF VOLATILE ORGANIC COMPOUNDS FROM SOURCE OPERATIONS
Section 7:27B-3.6 - Procedures for the determinations of vapor pressures of a single known VOC or mixtures of known and/or unknown VOC

Universal Citation: NJ Admin Code 7:27B-3.6

Current through Register Vol. 56, No. 24, December 18, 2024

(a) The vapor pressure of a single known volatile organic substance shall be determined as follows:

1. The vapor pressure of certain single known VOC may be found in the following, or other sources which shall be submitted to the Department for review, pursuant to N.J.A.C. 7:27B-3.2(c), (d), and (e), and may be used provided the vapor pressure was measured and the VOC was certified by the manufacturer or by the National Bureau of Standards as being of or equivalent to research grade.

i. Weast, R.C., "Handbook of Chemistry and Physics," Section D, Chemical Rubber Co., Cleveland, Ohio;

ii. Perry, J.H., "Chemical Engineers" Handbook, Section 3, McGraw-Hill, New York;

iii. Lange, N.A., "Handbook of Chemistry," McGraw-Hill, New York;

iv. Boublik, T.; Grued, V.; and Hala, E., "The Vapor Pressure of Pure Substances," Elsevier Scientific Publishing, New York;

v. Jordan, T.E., "Vapor Pressure of Organic Compounds" Interscience Publishers, New York.

2. In the absence of the referenced data above, the vapor pressure of the single VOC may be determined by the following methods:

i. "Method 1-Dry RVP Measurement Method" or "Method 2-Herzog Semi-Automatic Method" promulgated at 40 CFR 80, Appendix E; or any other test Method approved in advance in writing by the Department and the EPA, (N.J.A.C. 7:27B-3.18, Reference 3). This method may be used only if the sensitivity of the pressure measuring device is sufficient for the vapor pressure level. The results must be converted to and reported as the true vapor pressure at standard conditions (N.J.A.C. 7:27B-3.18, Reference 5); or

ii. ASTM Designation D2879-75, "Standard Method of Test for Vapor Pressure--Temperature Relationship and Initial Decomposition Temperature of Liquids by Isoteniscope" (N.J.A.C. 7:27B-3.18, Reference 4).

(b) The vapor pressures of mixtures of known VOC in known proportions shall be determined as follows:

1. Data on partial pressure for certain mixtures of VOC are published in the International Critical Tables and in scientific journals. The vapor pressure of a mixture which has been reported in such sources will be acceptable provided the source is documented by a reprint which shall be submitted for review by the Department, pursuant to N.J.A.C. 7:27B-3.2(c), (d) and (e).

2. The vapor pressure may also be determined by the method set forth in (a)2i above. The Reid method is applicable to volatile crude oil and volatile nonviscous petroleum products and other mixtures of VOC. For petroleum and petroleum distillates, refer to American Petroleum Institute (API) Bulletin 2517, "Selecting the Proper Nomograph" (N.J.A.C. 7:27B-3.18, Reference 5). The Reid vapor pressure can be converted to true vapor pressure at standard conditions. For mixtures other than petroleum and petroleum distillates, the resulting Reid vapor pressure may be converted to true vapor pressure at standard conditions using Table 1.

TABLE 1

CONVERSION OF REID VAPOR PRESSURES TO TRUE VAPOR PRESSURES

Reid Vapor Pressure Psia

True Vapor Pressure Psia

Reid Vapor Pressure Psia	True Vapor Pressure Psia
1	0.5
2	1.1
3	1.7
4	2.3
5	2.9
6	3.6
7	4.2
8	4.8
9	5.5
10	6.1
11	6.7
12	7.4
13	8.0
14	8.6
14.7	9.0

NOTE: Straight-line interpolation is to be used for intermediate values.

Applicable for VOC other than petroleum and petroleum distillates.

1. The method set forth in (a)2i above;

2. ASTM Designation D2551-80, "Standard Method of Test of Vapor Pressure of Petroleum Products (Micromethod)" (N.J.A.C. 7:27B-3.18, Reference 6); or

3. The method set forth in (a)2ii above.

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