40 CFR § 60.224 - Test methods and procedures.

---
identifier: "/us/cfr/t40/s60.224"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 60.224 - Test methods and procedures."
title_number: 40
title_name: "Protection of Environment"
section_number: "60.224"
section_name: "Test methods and procedures."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "60"
part_name: "STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "36 FR 24877, Dec. 23, 1971, unless otherwise noted."
cfr_part: "60"
---


# 60.224 Test methods and procedures.

(a) In conducting the performance tests required in § 60.8, the owner or operator shall use as reference methods and procedures the test methods in appendix A of this part or other methods and procedures as specified in this section, except as provided in § 60.8(b).

(b) The owner or operator shall determine compliance with the total fluorides standard in § 60.222 as follows:

(1) The emission rate (E) of total fluorides shall be computed for each run using the following equation:

where:

E = emission rate of total fluorides, g/Mg (lb/ton) of equivalent P<sub>2</sub>O<sub>5</sub> feed.

C<sub>si</sub> = concentration of total fluorides from emission point “i,” mg/dscm (gr/dscf).

Q<sub>sdi</sub> = volumetric flow rate of effluent gas from emission point “i,” dscm/hr (dscf/hr).

N = number of emission points associated with the affected facility.

P = equivalent P<sub>2</sub>O<sub>5</sub> feed rate, Mg/hr (ton/hr).

K = conversion factor, 1000 mg/g (7,000 gr/lb).

(2) Method 13A or 13B shall be used to determine the total fluorides concentration (C<sub>si</sub>) and volumetric flow rate (Q<sub>sdi</sub>) of the effluent gas from each of the emission points. The sampling time and sample volume for each run shall be at least 60 minutes and 0.85 dscm (30 dscf).

(3) The equivalent P<sub>2</sub>O<sub>5</sub> feed rate (P) shall be computed for each run using the following equation:

P = M<sub>p</sub> R<sub>p</sub>

where:

M<sub>p</sub> = total mass flow rate of phosphorus-bearing feed, Mg/hr (ton/hr).

R<sub>p</sub> = P<sub>2</sub>O<sub>5</sub> content, decimal fraction.

(i) The accountability system of § 60.223(a) shall be used to determine the mass flow rate (M<sub>p</sub>) of the phosphorus-bearing feed.

(ii) The Association of Official Analytical Chemists (AOAC) Method 9 (incorporated by reference—see § 60.17) shall be used to determine the P<sub>2</sub>O<sub>5</sub> content (R<sub>p</sub>) of the feed.

[54 FR 6670, Feb. 14, 1989, as amended at 65 FR 61757, Oct. 17, 2000; 80 FR 50434, Aug. 19, 2015]