---
kind: "section"
citation: "40 C.F.R. § 761.253"
title: "40"
number: "761.253"
heading: "Chemical analysis."
url: "https://uscodex.org/cfr/40/761.253"
---

# §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](/cfr/40/761.19.md)). Modifications to the methods listed in this paragraph or alternative methods not listed may be used if validated under [Subpart Q](/cfr/40/subpartQ.md) of this part or authorized in a [§ 761.61(c)](/cfr/40/761.61.md?p=c) approval.
- (b) **Report all PCB sample concentrations in µg/100 cm 2 (16 square inches) of surface sampled.** If sampling an area smaller than 100 cm 2, report converted sample concentrations in accordance with [§ 761.243(b)](/cfr/40/761.243.md?p=b).

## Notes

### Amendments

[63 FR 35462, June 29, 1998, as amended at 88 FR 59695, Aug. 29, 2023]

### Source

Source: 63 FR 35462, June 29, 1998, unless otherwise noted.

### Authority

Authority: 15 U.S.C. 2605, 2607, 2611, 2614, and 2616 and 42 U.S.C. 6939g.

### Source

Source: 43 FR 7156, Feb. 17, 1978, unless otherwise noted.

### Amendments

[63 FR 35462, June 29, 1998, as amended at 88 FR 59695, Aug. 29, 2023]