Care in the preparation and preservation of reagents, together with certain modifications in apparatus and technique, have eliminated the difficulties from plasma ammonia analysis. Ammonia contamination from the laboratory atmosphere has not proved an especial hazard, and no major setback has been encountered in the analysis of several thousand specimens over the last few years. The method has ...

A microbore continuous-flow analyser was used to determine ammonia, nitrite, nitrate and phosphate in seawater. Ninety samples per hour were measured by optimizing the hydraulic conditions and using a cadmium coil for nitrate reduction. The analysis range was extended and the detection limit was reduced by using two analytical ranges with automatic range-changing. Interference from magnesium on...

The trimethylamine content of most marine fish, especially the gadoid species, is internationally accepted as an index ofspoilage. However, ammonia, dimethylamine, and other aminesalso contribute to the trimethylamine value. Variations in the conditions of the three current methods used to analyze for trimethylamine content were studied in detail to determine the best condition to extract trime...

La/Fe/TiO₂ composite photocatalysts were synthesized by Sol-Gel method and well characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen-physical adsorption, and UV-Vis diffuse reflectance spectra (UV-Vis DRS). It is interesting that the doped catalysts were in anatase phase while the pure TiO₂ was in rutile phase. In addition, the composites possessed bette...

Ammonia is now frequently used in armed robberies by assailants, who possibly misguidedly imagine that it is an easy and safe method of temporarily incapacitating their victim. Nevertheless, two case histories are presented to illustrate the early rise of intraocular pressure which may occur after excessive exposure of the eye to ammonia. The clinical appearance in many respects mimicked that o...

85 Summary In this brief review a manual micro-Kjeldahl digestion procedure is outlined, which is satisfactory for most substances of biological origin. The final step of ammonia determination may be achieved by steam distillation and titration, if only one or two samples are to be processed. If up to say thirty or forty analyses/d are to be analysed then the semi-automated procedure has consid...

Ammonia-nitrogen is the predominant pollutant in the main drinking water sources, which is also, can cause failure in water treatment process due to the inhibition effect. Our study confirmed that the freeze separation process seems to have potential for ammonia removal from water. The effect of different operational factors including initial concentration of ammonia and ion species were also i...

In this study, SiO2 nanoparticles were successfully synthesized via sol-gel precipitation method and the effects of different parameters such as temperature, ethanol, ammonia and tetraethylorthosilicate (TEOS) contents based on water were investigated in a systematic way applying Taguchi experimental design method. It was found that, among all the investigated parameters, ethanol as a co-solven...

The fact that the ammonia content of shed blood under aseptic conditions increases is well known and is taken into account as much as possible by a.rapid procedure in methods for the determination of preformed ammonia. Suggestions as to the source of this slowly liberated ammonia have as yet led to no positive findings. My experiments were undertaken to determine whether with aseptic measures t...

Patlak graphical analysis was applied to quantify renal cortical blood flow with N-13 ammonia and dynamic positron emission tomography. Measurements were made in a swine model of kidney transplantation with a wide range of normal and abnormal renal blood flows (N = 57 studies) and in 20 healthy human volunteers (N = 45 studies). Estimates of renal cortical blood flow by the Patlak method were c...