A simple device for quantitative colorimetric diffuse reflectance measurements

Matias, F.A.A.; Vila, Marta Maria Duarte Carvalho; Tubino, Matthieu

doi:10.1016/s0925-4005(02)00309-x

Cited by 55 publications

(51 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1 was similar to what has been described for other portable reflectometers [25][26][27]. The common features were a white colored bottom for the sample cell with the surrounding surfaces being black.…”

Section: Methodssupporting

confidence: 59%

See 1 more Smart Citation

Classification and quantitative optical analysis of liquid and solid samples using a mobile phone as illumination source and detector

Iqbal

Eriksson

2013

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

A mobile phone has been used both as illumination source and image detector for quantitative optical analysis of colored liquid samples (4 different colorants) and solid samples (printed color patterns, plastic beads and colored sand grains). Even though the measurement conditions were far from ideal, because the light source was strongly polychromatic and the illumination was not a collimated light beam with homogeneous light intensity, a logarithmic concentration dependence, in accordance with the Beer-Lambert law, described the data of the colored liquids quite well. By utilizing blue-blue (420-510 nm), green-green (480-590 nm) and red-red (575-695 nm) illumination/detection combinations, each sample could be assigned a unique color signature for classification that agreed with reference absorbance spectra measured with a spectrometer. Quantification of validation samples within a few percent of the actual values was achieved. Also the long-term repeatability of the measurements was investigated and was surprisingly good for such a simple system. Analysis of the colored solid samples was more complex with results being dependent on the morphology and colorimetric properties of the samples

show abstract

Section: Methodssupporting

confidence: 59%

“…Thus R = 1 for pure de-ionized water, just as T = 1 for a non-absorbing liquid in a transmission experiment. The optical density of the sample is A=-ln R by analogy to the relationship between transmittance and absorbance [25].…”

Section: Methodsmentioning

confidence: 99%

Classification and quantitative optical analysis of liquid and solid samples using a mobile phone as illumination source and detector

Iqbal

Eriksson

2013

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

show abstract

“…Matias et al [8] developed a very simple and low-cost reflectometer for diffuse reflectance measurements. This device uses an LED as a light source and a light dependent resistor (LDR) as a detector for reflectance measurements.…”

Section: Introductionmentioning

confidence: 99%

Novel fused-LEDs devices as optical sensors for colorimetric analysis

Lau

2004

Talanta

View full text Add to dashboard Cite

“…Despite the fact that analytical reflectometric methods in the visible region of the spectrum are not very common, some have been recently published. [17][18][19][20][21][22][23][24] The diffuse reflectance methods present some advantages, such as simplicity and extremely low consumption of reagents. Moreover, the reflectance measurements can be performed in locus using a very simple homemade reflectometer or a portable diffuse reflectance spectrophotometer, which are small, lightweight, inexpensive and battery operated, characteristics highly attractive to facilitate analysis at the location of the system under investigation.…”

Section: Introductionmentioning

confidence: 99%

Determination of ambroxol in syrups using diffuse reflectance spectroscopy

Rufino¹,

Santos²,

Rodrigues³

et al. 2009

Quím. Nova

View full text Add to dashboard Cite

Recebido em 6/8/08; aceito em 19/1/09; publicado na web em 3/7/09 This paper reports an analytical method for the determination of ambroxol in micellar medium by spot test-diffuse reflectance spectroscopy. The reflectance measurements were performed analyzing the colored compound (λ= 520 nm) produced from the reaction between ambroxol and p-dimethylaminocinnamaldehyde on the surface filter paper. The linear range was from 1.21 × 10 −3 to 9.65 × 10 −3 mol L -1 (500 -4000 µg mL -1). The limit of detection and quantification were 3.50 x 10 -4 mol L -1 (145 µg mL -1 ) and 1.16 x 10 -3 mol L -1 (481 µg mL -1 ), respectively. Five commercial samples were analysed and the results obtained by the proposed method were in good agreement with those obtained by the literature method at 95% confidence level.

show abstract

A simple device for quantitative colorimetric diffuse reflectance measurements

Cited by 55 publications

References 24 publications

Classification and quantitative optical analysis of liquid and solid samples using a mobile phone as illumination source and detector

Classification and quantitative optical analysis of liquid and solid samples using a mobile phone as illumination source and detector

Novel fused-LEDs devices as optical sensors for colorimetric analysis

Determination of ambroxol in syrups using diffuse reflectance spectroscopy

Contact Info

Product

Resources

About