Spectrophotometric control of coloring impurities in cut glass

1977 ◽  
Vol 34 (1) ◽  
pp. 57-59
Author(s):  
V. A. Borgman
Keyword(s):  
Spectrophotometric Control

Effect of Day-To-Day Noise on UV-Visible Spectrophotometric Control Analyses of Mixtures by Principal Component Regression

1996 ◽  
Vol 50 (5) ◽  
pp. 576-582 ◽  
Author(s):  
Marcelo Blanco ◽  
Jordi Coello ◽  
Hortensia Iturriaga ◽  
Santiago Maspoch ◽  
Smail Alaoui-Ismaili
Keyword(s):  
Principal Component Regression ◽  
Principal Component ◽  
Diode Array ◽  
Unknown Sample ◽  
Noise Structure ◽  
Calibration Samples ◽  
Uv Visible ◽  
Squared Residuals ◽  
Detection Of Outliers ◽  
Spectrophotometric Control

It is demonstrated that noise in UV spectral recordings obtained by using a diode array UV-visible spectrophotometer on different days may conform to a defined pattern. Such structured noise leads to the acceptance, as significant, of components containing noise alone, in calibrations by principal component regression (PCR)—which impedes the detection of outliers at the unknown sample prediction stage and considerably diminishes the potential of this methodology for control analyses. As shown in this paper, the effect of the noise structure can be substantially decreased by recording the spectra for the calibration samples on different days. Also, a procedure for distinguishing between correct samples and outliers is proposed. The procedure fits the distribution of the squared residuals of the absorbances for the calibration samples to an exponential function and uses a 99.9% probability as the acceptable limit. It was applied to analysis of ketoprofen and methylparaben mixtures.

Spectrophotometric control of dope distribution profiles in laminated semiconductor structures

1993 ◽  
Vol 59 (5-6) ◽  
pp. 908-912
Author(s):  
O. L. Artemenko ◽  
G. V. Litvinovich ◽  
V. K. Matchenya ◽  
V. V. Nelaev ◽  
B. B. Sevruk
Keyword(s):  
Semiconductor Structures ◽  
Spectrophotometric Control

scholarly journals A Novel Correlation for Rapid Lactose Determination in Milk by a Cryoscopic Technique

2006 ◽  
Vol 89 (6) ◽  
pp. 1581-1584 ◽  
Author(s):  
Carmen Colinas ◽  
Ignacio Barrera ◽  
Carlos A Blanco
Keyword(s):  
Freezing Point ◽  
Low Cost ◽  
Line Measurement ◽  
Lactose Concentration ◽  
Close Relationship ◽  
On Line ◽  
Simple Measurement ◽  
Enzymatic Procedure ◽  
Spectrophotometric Control ◽  
Operational Simplicity

Abstract Residual lactose in special milk was systematically determined for people with lactose intolerance by means of a rapid on-line measurement of the cryoscopic point. A proposed cryoscopic procedure was compared to 2 conventional yet highly laborious methods: the enzymatic procedure with spectrophotometric control and the polarimetric method. Several experiments with different mixtures of both semi-skimmed and low-lactose milk were performed. A lineal relationship was found between lactose concentration and freezing point, the analytical equation for which shows a close relationship regarding the 3 methods used. The advantages of the cryoscopic procedure include speed in obtaining results and operational simplicity at a low cost, better monitoring of enzymatic hydrolysis kinetics, and greater control over the production process for delactosed milk. The equation obtained also enables prediction of the lactose percentage in commercial milk by a simple measurement of freezing point.

A bioelectrochemical cell allowing simultaneous spectrophotometric control of the analyte

2000 ◽  
Vol 36 (3) ◽  
pp. 306-309
Author(s):  
S. V. Shleev ◽  
S. V. Kuznetsov ◽  
A. F. Topunov
Keyword(s):  
Spectrophotometric Control

pH-sensitive spectrophotometric control of nilutamide in an automatic micro-flow system

2014 ◽  
Vol 38 (7) ◽  
pp. 2856 ◽  
Author(s):  
Mélodie M. Carvalho ◽  
David S. M. Ribeiro ◽  
João L. M. Santos ◽  
João A. V. Prior
Keyword(s):  
Flow System ◽  
Ph Sensitive ◽  
Micro Flow ◽  
Spectrophotometric Control
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