Ill. Admin. Code tit. 35 § 611.600

Current through Register Vol. 48, No. 49, December 6, 2024

Section 611.600 - Applicability

Certain suppliers must monitor to determine compliance with the State-only MCLs in Section 611.300 and the revised MCLs in 611.301, as appropriate, as this Subpart N requires:

a) CWS suppliers.

b) NTNCWS suppliers.

c) Transient non-CWS suppliers to determine compliance with the nitrate and nitrite MCLs.

d) Detection Limits. Specific detection limits apply for this Subpart N (this list includes MCLs from Section 611.301 are for information purposes only):

Contaminant		MCL (mg/L, except asbestos)	Method	Detection Limit (mg/L)

Antimony		0.006	Atomic absorption - furnace technique	0.003
			Atomic absorption - furnace technique (stabilized temperature)	0.0008⁵
			Inductively coupled plasma-mass spectrometry	0.0004
			Atomic absorption - gaseous hydride technique	0.001
Arsenic		0.010	Atomic absorption - furnace technique	0.001
			Atomic absorption - furnace technique (stabilized temperature)	0.00005⁶
			Atomic absorption - gaseous hydride technique	0.001
			Inductively coupled plasma-mass spectrometry	0.0014⁷
Asbestos		7 MFL¹	Transmission electron microscopy	0.01 MFL
Barium		2	Atomic absorption - furnace technique	0.002
			Atomic absorption - direct aspiration technique	0.1
			Inductively coupled plasma arc furnace	0.002
			Inductively coupled plasma	0.001
Beryllium		0.004	Atomic absorption - furnace technique	0.0002
			Atomic absorption - furnace technique (stabilized temperature)	0.00002⁵
			Inductively coupled plasma²	0.0003
			Inductively coupled plasma-mass spectrometry	0.0003
Cadmium		0.005	Atomic absorption - furnace technique	0.0001
			Inductively coupled plasma	0.001
Chromium		0.1	Atomic absorption - furnace technique	0.001
			Inductively coupled plasma	0.007
			Inductively coupled plasma	0.001
Cyanide		0.2	Distillation, spectrophotometric³	0.02
			Automated distillation, spectrophotometric³	0.005
			Distillation, selective electrode³	0.05
			Distillation, amenable, spectrophotometric⁴	0.02
			UV, distillation, spectrophotometric⁸	0.0005
			Micro distillation, flow injection, spectrophotometric³	0.0006
			Ligand exchange with amperometry⁴	0.0005
Mercury		0.002	Manual cold vapor technique	0.0002
			Automated cold vapor technique	0.0002
Nickel		No MCL	Atomic absorption - furnace technique	0.001
			Atomic absorption - furnace technique (stabilized temperature)	0.0006⁵
			Inductively coupled plasma²	0.005
			Inductively coupled plasma-mass spectrometry	0.0005
Nitrate (as N)		10	Manual cadmium reduction	0.01
			Automated hydrazine reduction	0.01
			Automated cadmium reduction	0.05
			Ion-selective electrode	1
			Ion chromatography	0.01
			Capillary ion electrophoresis	0.076
Nitrite (as N)		1	Spectrophotometric	0.01
			Automated cadmium reduction	0.05
			Manual cadmium reduction	0.01
			Ion chromatography	0.004
			Capillary ion electrophoresis	0.103
Selenium		0.05	Atomic absorption - furnace technique	0.002
			Atomic absorption - gaseous hydride technique	0.002
Thallium		0.002	Atomic absorption - furnace technique	0.001
			Atomic absorption - furnace technique (stabilized temperature)	0.0007⁵
			Inductively coupled plasma-mass spectrometry	0.0003
Footnotes.
¹	"MFL" means millions of fibers per liter less than 10 µm.
²	Using a 2x preconcentration step as noted in USEPA 200.7(94). Lower MDLs are possible when using a 4x preconcentration.
³	Screening method for total cyanides.
⁴	Measures "free" cyanides when omitting distillation, digestion, or ligand exchange.
⁵	Lower MDLs are possible using stabilized temperature graphite furnace atomic absorption.
⁶	The MDL for USEPA 200.9(94) (atomic absorption-platform furnace (stabilized temperature)) possible using a 2x concentration step during sample digestion. The MDL using direct analyses (i.e., no sample digestion) is higher. Using multiple depositions, USEPA 200.9(94) can obtain an MDL of 0.0001 mg/L.
⁷	Using selective ion monitoring, USEPA 200.8(94) (ICP-MS) is capable of obtaining an MDL of 0.0001 mg/L.
⁸	Measures total cyanides when using UV-digestor, and "free" cyanides when bypassing UV-digestor.

Ill. Admin. Code tit. 35, § 611.600

Amended at 37 Ill. Reg. 1978, effective February 4, 2013

Amended at 39 Ill. Reg. 3713, effective 2/24/2015

Amended at 42 Ill. Reg. 1140, effective 1/4/2018

Amended at 44 Ill. Reg. 6996, effective 4/17/2020

Amended at 47 Ill. Reg. 16486, effective 11/2/2023

BOARD NOTE: Subsections (a) through (c) derive from 40 CFR 141.23 preamble, and subsection (d) derives from 40 CFR 141.23 (a)(4)(i) and appendix A to subpart C of 40 CFR 141. See the Board Note at Section 611.301(b) relating to the MCL for nickel.