40 CFR § 761.253 - Chemical analysis.
---
identifier: "/us/cfr/t40/s761.253"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 761.253 - Chemical analysis."
title_number: 40
title_name: "Protection of Environment"
section_number: "761.253"
section_name: "Chemical analysis."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "R"
subchapter_name: "TOXIC SUBSTANCES CONTROL ACT"
part_number: "761"
part_name: "POLYCHLORINATED BIPHENYLS (PCBs) MANUFACTURING, PROCESSING, DISTRIBUTION IN COMMERCE, AND USE PROHIBITIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "15 U.S.C. 2605, 2607, 2611, 2614, and 2616 and 42 U.S.C. 6939g."
regulatory_source: "43 FR 7156, Feb. 17, 1978, unless otherwise noted."
cfr_part: "761"
---
# 761.253 Chemical analysis.
(a) Select applicable method(s) from the following list to extract PCBs and determine the PCB concentration from the standard wipe sample collection medium: SW-846 Method 3540C, Method 3550C, Method 3541, Method 3545A, Method 3546, or Method 8082A (all standards incorporated by reference in § 761.19). Modifications to the methods listed in this paragraph or alternative methods not listed may be used if validated under Subpart Q of this part or authorized in a § 761.61(c) approval.
(b) Report all PCB sample concentrations in µg/100 cm
<sup>2</sup> (16 square inches) of surface sampled. If sampling an area smaller than 100 cm
<sup>2</sup>, report converted sample concentrations in accordance with § 761.243(b).
[63 FR 35462, June 29, 1998, as amended at 88 FR 59695, Aug. 29, 2023]