SPEX CertiPrep 2023 — Heavy metals in hot sauce and chili powder (US)
An industry application note from SPEX CertiPrep (ZeptoMetrix) analysed 7 chili powder blends and 6 red pepper hot sauces purchased from US retail sources ranging from 20/oz by ICP-MS after cryogenic grinding and microwave digestion. The most prevalent heavy metal in chili powders was chromium (3.1–7.0 µg/g), with the highest concentrations found in a dollar-store chili powder. Lead, cadmium, and arsenic were also detected. For hot sauces, lead and chromium were consistently present in all samples; the highest exposure concern was a Chinese fast-food hot sauce in individual serving packets, where two packets (20 g) contributed approximately 20.6 µg Pb and 63 µg Cr, each approaching 30% of an adult’s estimated daily limit.
Key numbers
Chili powder concentrations (n=7, all red pepper/chili blends of unknown composition):
- Cr: 3.1–7.0 µg/g (highest in dollar-store sample)
- Cd: up to 1.2 µg/g (dollar-store sample)
- As (total): up to 0.4 µg/g (dollar-store sample)
- Pb: up to 1.6 µg/g (highest in organic chili powder); dollar-store sample <1 µg/g
- Hg: not found in significant concentrations in red pepper products
Hot sauce concentrations and exposure (n=6):
- Pb and Cr consistently present in all hot sauces
- Chinese fast-food hot sauce (individual packets, ~10 g/packet): 2 packets (20 g serving) = 20.6 µg Pb and 63 µg Cr (~30% of adult daily allowable limit each)
- Some sauces also contained measurable As and Cd
- Hg: not detected at significant concentrations
Contextual comparison across all spices tested (beyond red pepper/chili):
- Red pepper/chili had the highest As and Cd of all spices tested
- Only cinnamon and turmeric samples exceeded red pepper/chili for highest Pb levels
Method: Cryogenic grinding; microwave digestion (CEM Mars 5, 0.2 g sample, 10 mL HNO3, 15 min ramp to 210°C, 15 min hold, with HF for high-silica samples); Agilent ICP-MS 7700 (Meinhard nebulizer, cyclonic spray chamber); SPEX CertiPrep CLMS-1/2/3/4 multi-element standards; normal mode (air) and collision mode (helium). LOD/LOQ not explicitly reported in the application note.
Note: This is an industry application note demonstrating analytical instrumentation capabilities, not a peer-reviewed research publication. No uncertainty estimates, no certified reference material recoveries explicitly reported beyond instrument performance claims. Sample selection was convenience-based (retail purchasing). Use as indicative data for spice contamination screening; verify against peer-reviewed sources for quantitative risk assessment.
Methods (brief)
Industry application note by SPEX CertiPrep (a standards and certified reference material company, now distributed by ZeptoMetrix). Samples were convenience-purchased at various US retail outlets. No experimental design, statistical analysis, or uncertainty reporting. ICP-MS method with cryogenic grinding and microwave digestion is consistent with standard analytical practice. The note reports on red pepper products as a subset of a broader spice contamination study; other spices (cinnamon, turmeric) were also tested but are not the focus of this batch.
Implications
Certification: Confirms Pb, Cd, Cr, and tAs presence in US-retail chili powders and hot sauces, with the dollar-store chili powder showing the highest multi-metal contamination profile. The organic chili powder showed the highest Pb (1.6 µg/g). The serving-size exposure framing for hot sauce packets is practically important for product-level risk communication. These data are indicative rather than definitive; A-tier peer-reviewed spice studies should anchor quantitative thresholds.
Courses: Useful for illustrating that price and “organic” designation are not reliable predictors of heavy metal content in dried spices. The contrast between dry spice concentration vs serving-size exposure (high concentration in powder, but low serving; lower concentration in liquid sauce, but higher serving) is a key risk-communication teaching point.
App: Chili powder Pb range up to 1.6 µg/g (1,600 ppb); Cr up to 7.0 µg/g (7,000 ppb); Cd up to 1.2 µg/g (1,200 ppb); tAs up to 0.4 µg/g (400 ppb). Flag as B-tier indicator data pending peer-reviewed confirmation.