National Institute for Occupational Safety and Health

“ A maximum of about sixteen 15-μL portions of solution can be distributed on the filter. Thus, a maximum of about 400 mg of cyanuric acid can be applied to the filter with the recovery stock solution. A recovery stock solution which has a much higher concentration of cyanuric acid in water at room temperature can not be prepared because the limit of solubility of cyanuric acid in water at room temperature is about 2.5 mg/mL. If higher loadings are needed, allow the first portions to dry and repeat the process. b. Join the front piece of the cassette filter holder with the back piece. ”

“ Ingestion of methanol may cause blindness or death. Methanol is a fire hazard (flash point 12 °C) .
SAMPLING: 1. 2. 3. 4.
Calibrate each personal sampling pump with a representative sampler in line. Attach sampler to personal sampling pump with flexible tubing. Sample at an accurately known flow rate between 1 and 3 L/min for a total sample size of 10 to 1000 L. Limit the maximum loading of particulate matter on the filter to about 1 mg. ”

“ None identified for air analysis. HPLC method for measurement in solution is a variation of the method of Briggle et al. [2] .
NIOSH Manual of Analytical Methods (NMAM) , Fourth Edition, 8/15/94 CYANURIC ACID: METHOD 5030, Issue 2, dated 15 August 1994 - Page 2 of 4 EQUIPMENT:
REAGENTS: 1. 2. 3. 4. 5. 6.
7.
8.
Cyanuric acid, ≥98% pure.* Water, distilled. Methanol, chromatographic quality.* Na 2HPO 4·7H 2O, reagent grade. HCl, 1 M (aqueous) . Eluent and mobile phase: 0.005 M Na 2HPO 4, 5:95 (v:v) methanol:water at pH = 7.0. Dissolve 5.36 g of Na 2HPO 4·7H 2O in 2000 mL water. ”