Ultraviolet Absorption Spectrophotometry

Rosenbaum, E. J.

doi:10.1021/ac60085a004

Cited by 10 publications

(3 citation statements)

References 216 publications

(83 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…directed toward inorganic compounds until very recently. Little information of analytical value is available about simple or complex ion spectra in general, though some studies may be found in the reviews of Rosenbaum (9). For that reason, a systematic survey has been made of a number of common anions which might absorb in the ultraviolet either by themselves or in the form of complexes with metal cations: sulfate, thiosulfate, peroxydisulfate, sulfite, nitrate, nitrite, chlorate, perchlorate, brómate, iodate, metaperiodate, vanadate, tungstate, molybdate, cyanide, cyanate, thiocyanate, borate, phosphate, phosphite, hypophosphite, and pyrophosphate.…”

mentioning

confidence: 99%

Ultraviolet Absorption Spectra of Some Inorganic Ions in Aqueous Solutions

Buck¹,

Singhadeja²,

Rogers³

1954

Anal. Chem.

143

View full text Add to dashboard Cite

mentioning

confidence: 99%

Ultraviolet Absorption Spectra of Some Inorganic Ions in Aqueous Solutions

Buck¹,

Singhadeja²,

Rogers³

1954

Anal. Chem.

143

View full text Add to dashboard Cite

“…Spectrophotometry in the visible region is a technique that can be used directly in the productive sector of fish farming due to the lower cost, ease of operation and staff training besides the portability, allowing the control of MT levels directly in the property. There are few studies involving the determination of MT by spectrophotometry among which methods in the UV region at 241 nm [18,19], but several organic molecules present in the sample matrix can absorb in the ultraviolet region, with decreasing the resolution of the analytical method. Methods that use the visible region can have less interference and lower cost and are essential for application in several fields of the productive sector.…”

Section: Introductionmentioning

confidence: 99%

Development of a Spectrophotometric Method for the Determination of 17α-methyltestosterone

Lindino¹,

Savaris²,

Alberton³

et al. 2019

Br J Anal Chem

View full text Add to dashboard Cite

Contamination of waters by 17α-methyltestosterone (MT) has increased in recent years due to the increase in the fish farms production. This work describes the determination of the MT hormone by a new spectrophotometric method in the visible region, after the reaction with potassium nitroprusside with the generation of a compound having maximum absorbance at 400 nm. To understand the process of the compound formation, geometry optimizations were performed at MPW1PW91/6-311+G (2d,2p) level of theory and the calculations showing that the NO group of nitroprusside bonds to the carbon with double bond adjacent to the carbonyl of 17α-methyltestosterone. In this method, MT was determined at the concentration between 8.0 x 10 -8 and 2.7 x 10 -7 mol L -1 with a coefficient of determination of 0.9946. The relative standard deviation for the repeatability in nine replicates was 2.37% for [MT] = 1.50 x 10 -7 mol L -1 . Limit of detection (LOD) was calculated as 1.75 x 10 -8 mol L -1 and the limit of quantification (LOQ) was established as the lowest value of the linear concentration range (8.0 x 10 -8 mol L -1 ). This spectrophotometric method was suitable according to the analysis of analytical figures of merit, it has low cost and can be applied to samples of fish farm waters with portable spectrophotometers for in situ measurements, increasing the environmental control with rapid analysis.

show abstract

“…A more accurate measurement can be obtained by using four resistor cells, two of which are placed within a known air pressure, while the other two are placed within the unknown air pressure. The four resistances are arranged in a Wheatstone bridge (69,103). a 2.…”

mentioning

confidence: 99%

Some Principles in Amplifier Technique: In the Physiology of Respiration and Circulation

Ibsen¹

1962

Acta Anaesthesiol Scand

View full text Add to dashboard Cite

Since the energy produced by an object may be small in relation to the time taken to produce it, it becomes necessary to utilize amplifier technique as in electrocardiography or electro-encephalography. With the appearance of better electronic equipment wider fields have now become capable of measurement in both clinical and experimental medicine. A survey of the physical principles and of various methods for measurements is presented below.To understand the electronic terminology used in this article the following definitions should be recalled.A difference in potential or voltage, E, (measured in volts) between two points of an electrical conductor will cause a current, I, (measured in amperes) between the two points. The current depends upon the resistance, R, (measured in ohms), of the conductor. This relationship is expressed in the formula (Ohm's law) :When the potential is constant, i.e., when the circuit has a constant polarity, designated by either + or -, the resultant current is a direct one (DC). When the potential is alternating, i.e., when there is shifting polarity, the current is alternating (AC). The number of polarity shifts per second is designated as the frequency (cps or Hz). A condenser can transmit only AC, against which it has a resistance inversely proportional to the frequency of the current and to the capacity of the condenser (measured in microfarad, MF). A coil (with or without an iron core) has a greater resistance to AC than to DC. The difference between the resistance to AC and DC depends on the inductance of the coil (measured in henrys, H). The resistance to AC increases with increasing frequency and with greater inductance.

show abstract

Ultraviolet Absorption Spectrophotometry

Cited by 10 publications

References 216 publications

Ultraviolet Absorption Spectra of Some Inorganic Ions in Aqueous Solutions

Ultraviolet Absorption Spectra of Some Inorganic Ions in Aqueous Solutions

Development of a Spectrophotometric Method for the Determination of 17α-methyltestosterone

Some Principles in Amplifier Technique: In the Physiology of Respiration and Circulation

Contact Info

Product

Resources

About