869 research outputs found
Clinical and histological differences of papillary thyroid carcinoma in patients with chronic lymphocytic thyroiditis
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A flow system with in-line blank correction applied to the spectrophotometric determination of total iron and chromium (VI) in wastewaters
A flow system using the sample as the carrier
with a propulsion device located after the detector is presented.
This approach allows the correction of the intrinsic
color of the sample, as it provides baseline adjustment
for each sample. A confluence situated just after the selection
valve allows the sample composition to be adjusted
for the colorimetric measurement. The developed methodology
was applied to the colorimetric determination of total
Fe and Cr (VI) in wastewaters at 0.1–6.0 mg L–1 and
0.03–1.0 mg L–1, respectively. RSDs lower than 3% and a
sampling rate of approximately 40 h–1 were obtaine
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