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


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Saracoglu S. , Elçi L.

ANALYTICAL SCIENCES, cilt.15, ss.569-573, 1999 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 15 Konu: 6
  • Basım Tarihi: 1999
  • Doi Numarası: 10.2116/analsci.15.569
  • Dergi Adı: ANALYTICAL SCIENCES
  • Sayfa Sayıları: ss.569-573

Özet

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.