Monitor chronic exposure to arsenic
Screw cap plastic container (sterile)
Do not use preservatives. Preservatives used for routine analysis may contain mercuric oxide (ie, Stabilur), which interferes with all metal testing.
24 hr urine collection container, no additive
Ambient (preferred) - 14 days
Refrigerated - 14 days
Frozen - 14 days
High Performance Liquid chromatography / Inductively coupled plasma-mass spectrometry (HPLC/ICP-MS)
Total arsenic: 0−50 μg/L, 0−50 μg/24 hours
Inorganic arsenic: < 20 μg/L
BEI®, inorganic arsenic plus methylated metabolites (sampling time is end of work week): 35 μg/L creatinine
Sampling time is the end of the work week for industrial exposure monitoring. Metals with timing "end of work week" (meaning four or five consecutive working days with exposure) are eliminated with half-lives longer than five hours. Such metals accumulate in the body during the work week; therefore, their timing is critical in relation to previous exposures.