Effectiveness of palladium-sodium azide modifier for the direct determination of urinary cadmium by graphite-furnace atomic absorption spectrometry

Saracoglu S., Elci L.

ANALYTICAL SCIENCES, vol.15, no.6, pp.569-573, 1999 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 15 Issue: 6
  • Publication Date: 1999
  • Doi Number: 10.2116/analsci.15.569
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.569-573
  • Istanbul Technical University Affiliated: No


A combination of palladium and sodium azide is proposed as a mixed modifier for cadmium determination in urine by graphite-furnace atomic absorption spectrometry using calibration against matrix-free standard solutions. It permits the use of a pretreatment temperature of 900 - 1000 degrees C and markedly reduces the background absorption caused by inorganic salt matrices. The urine was simply diluted 1+1 with the addition of 1% HCl, Pd and NaN3. The recovery of cadmium obtained from urine was higher than 95%. The relative standard deviation at a cadmium level of 2.10 - 4.56 mu g l(-1) was smaller than 4%. The detection limit (3 s, n=20) is 0.16 mu g l(-1) of cadmium.