Special PT Requirements

Nitrate + Nitrite (Categories 02 and 18)

• Drinking Water (WS): requires either:
• a nitrate + nitrite reference sample, or
• both a nitrate and a nitrite reference sample
• Wastewater, Soils, other (WP): requires only a nitrate reference sample

Underground Storage Tank (UST) Parameters

Currently, only the following PT Providers are approved to provide PTs for the Wisconsin UST parameters:

    APG, ERA, NSI, and Wibby Environmental

Diesel Range Organics (DRO)

Requires a PT sample containing the even-numbered alkanes from C-10 to C-28.
Analysis using the Wisconsin specific DRO method is required.

Gasoline Range Organics (GRO)

Requires a PT sample containing the following analytes:

Methyl-t-butyl ether	Ethylbenzene	o-Xylene	Naphthalene
Benzene	m-Xylene	1.2.4-Trimethylbenzene
Toluene	p-Xylene	1.3.5-Trimethylbenzene

Analysis using the Wisconsin specific GRO method is required.

Petroleum Volatiles (PVOC)

Requires a PT sample containing the following analytes:

Methyl-t-butyl ether	Ethylbenzene	o-Xylene
Benzene	m-Xylene	1.2.4-Trimethylbenzene
Toluene	p-Xylene	1.3.5-Trimethylbenzene

NOTE: A GRO PT sample can usually be analyzed for both GRO and PVOC simultaneously.

PAHs by HPLC and SIM-GC/MS

• The concentrations of reference sample results submitted for polynuclear aromatic hydrocarbons (PAHs) under Test Category 13 must be representative of the lower concentration ranges detectable by high performance liquid chromatography
(HPLC).
• PAH reference samples with higher concentrations representative of the ranges detectable by GC or GC/MS will not be accepted for certification under Test Category 13.
• When ordering reference samples for PAHs under Test Category 13, request reference samples in the concentration range appropriate for HPLC analysis by the State of Wisconsin.

Acid Herbicides vs. 2,4-D & Silvex Only

• Certification for Acid Herbicides, in general, requires a laboratory to analyze and obtain acceptable results on 80% of the herbicdes contained in the PT sample. The sasmple must contain at least 5 herbicides.
• Certification for 2,4-D and Silvex only requires a laboratory to analyze and pass only these two analytes in a PT sample.

Pesticides

• Carbamate Pesticides (LC)
  must analyze a reference sample consisting of representative carbamate pesticides.
• "Other" LC Pesticides
  For all other pesticides analyzed by LC, the required reference sample will be case-specific and determined by Laboratory Certification Program staff.
• Organophosphorus Pesticides
  must analyze a reference sample consisting of representative organophosphorus pesticides
Acid Herbicides
must analyze a reference sample consisting of representative acid herbicides
Nitrogen Pesticides
(which includes non-metabolite triazines), both nitrogen and triazine reference samples must be analyzed
Organochlorine Pesticides
must analyze a reference sample consisting of representative Organochlorine Pesticides
Acid Herbicides
must analyze a reference sample consisting of representative organophosphorus and acid herbicides