Chemistry Laboratory Guidebook
The Chemistry Laboratory Guidebook (CLG) contains test methods used by FSIS Field Service Laboratories to support FSIS regulatory activities. The CLG contains methods for the analysis of food composition, food additives, nutrients, veterinary drug and pesticide residues. Methods contained in the CLG are designed to provide FSIS analysts with written documentation to facilitate training, performance, quality assessment, and interpretation of data. FSIS does not specifically endorse any of the products mentioned in the CLG and acknowledges other products may be available for laboratory use.
Definitions for Chemistry Methods
Terms used in CLG methods are defined here
Residue Chemistry (Routine)
Residue Chemistry (Infrequent)
| Method Number |
Method Title | Effective Date |
|---|---|---|
| CLG-AMG1 | Confirmation of Aminoglycosides by HPLC-MS/MS | 2011-06-03 |
| CLG-FLQ2 | Confirmation of Fluoroquinolone Antibiotics by HPLC Ion Trap Mass Spectrometry | 2021-04-26 |
Residue Chemistry (Inactive)
Siluriformes Species Identification
| Method Number |
Method Title | Effective Date |
|---|---|---|
| CLG-FPCR | Fish Speciation by PCR/Sequencing of Mitochondrial Cytochrome Oxidase I (COI) Gene | 2020-04-30 |
Food Chemistry
| Method Number |
Method Title | Effective Date |
|---|---|---|
| CLG-MOI | Moisture Determination | 2018-05-18 |
| CLG-PRO4 | Protein Determination by Combustion | 2018-04-30 |
| CLG-FAT | Determination of Fat | 2009-08-10 |
| CLG-SLT | Determination of Salt | 2009-07-27 |
| CLG-PHS1 | Determination of Phosphate | 2009-08-10 |
| CLG-SFT1 | Determination of Sulfites | 2006-09-05 |
| CLG-ICT1 | Internal Cooking Temperature | 1993-05 |
| CLG-ICT2 | Internal Cooking Temperature/Coagulation | 1993-05 |
Inorganic Chemistry
| Method Number |
Method Title | Effective Date |
|---|---|---|
| CLG-TM3 | Determination of Metals by ICP-MS and ICP-OES (Optical Emission Spectrometry) | 2018-11-05 |
| CLG-ARS | Determination of Arsenic by Atomic Absorption Spectroscopy | 2016-06-20 |
| CLG-TM4 | Detection of Thallium, Arsenic and Mercury using ICP-AES | 2006-12-11 |
| CLG-CAL | Calcium/Tritimetric | 1993-05 |
| CLG-CAL2 | Calcium, Inductively Coupled Plasma (ICP) Determination | 2003-01-10 |
| CLG-MER | Determination of Mercury by Atomic Absorption Spectrophotometry | 1991-07 |
| CLG-MERC1 | Determination of Mercury by Atomic Absorption Spectroscopy | 2018-04-13 |
| CLG-SOCAL3 | Determination of Sodium and Calcium by ICP Atomic Emission Spectroscopy | 2014-09-25 |
All methods are offered as PDF documents. If you require an alternative format, please contact:
Chemistry Section
Laboratory Quality Assurance Staff, USDA/FSIS/OPHS
950 College Station Road
Athens, GA 30605
Phone: (706) 546-3559
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Chemistry Laboratory Guidebook
The Chemistry Laboratory Guidebook (CLG) contains test methods used by FSIS Laboratories to support the Agency's inspection program.