Comparison of Potassium Content of Fertilizers by Atomic Absorption and Sodium Tetraphenylboron

1967 ◽  
Vol 50 (1) ◽  
pp. 5-7 ◽  
Author(s):  
M L Mccrackan ◽  
H J Webb ◽  
H E Hammar ◽  
C B Loadholt
Keyword(s):  
Standard Deviation ◽  
Atomic Absorption ◽  
Screening Method ◽  
Atomic Absorption Spectrophotometry ◽  
Potassium Content ◽  
Absorption Spectrophotometry ◽  
The Difference ◽  
Sodium Tetraphenylboron ◽  
Simple Screening

Abstract Atomic absorption spectrophotometry is a rapid and simple screening method for determining potassium in fertilizers, especially when a large number of samples are processed. The potassium content of 1190 fertilizer samples was determined by both atomic absorption (4038Å) at a dilution of 1:400 and by the sodium tetraphenylboron method; correlation between the two methods was significant (r = 0.96). Triplicate analyses of 101 samples by each method showed precision of 0.229% by STPB and 0.424% by atomic absorption; standard deviation of the difference between the two procedures was 0.50%. Other elements normally found in fertilizers did not interfere at 4038Å.

Atomic Absorption Spectrophotometric Method for Determination of Water-Soluble Copper in Water-Insoluble Copper Fungicides: CIPAC Collaborative Study. Comparison with Bathocuproine Method

1981 ◽  
Vol 64 (1) ◽  
pp. 75-78
Author(s):  
F Sánchez Rasero ◽  
◽  
P G Balayannis ◽  
H P Beyers ◽  
E Celma ◽  
...  
Keyword(s):  
Atomic Absorption ◽  
Collaborative Study ◽  
The United States ◽  
Atomic Absorption Spectrophotometry ◽  
Water Soluble ◽  
Absorption Spectrophotometry ◽  
Aas Method ◽  
Standard Deviations ◽  
The Difference

Abstract An atomic absorption spectrophotometric (AAS) method was collaboratively studied by 8 laboratories from Africa, the United States, Australia, and Europe. The samples were dispersed in deionized water. After centrifuging and filtering, the water-soluble copper in the filtrate was acidified and measured by atomic absorption spectrophotometry, in an airacetylene flame, at 324.7 nm. The results from 7 laboratories were satisfactory and no unfavorable comments were received. Repeatability standard deviations ranged from 0.005 to 0.023, and reproducibility standard deviations ranged from 0.012 to 0.062. When compared with the bathocuproine method, the difference in bias between both methods is not significant. They were both adopted as full CIPAC methods, with the bathocuproine method as the referee method. Both methods have been adopted official first action.

Comparison of Serum Calcium Measurements Obtained with the SMA 12/60 and by Atomic Absorption Spectrophotometry

1971 ◽  
Vol 17 (10) ◽  
pp. 1047-1049 ◽  
Author(s):  
S Raymond Gambino ◽  
Ivelice Fonseca
Keyword(s):  
Atomic Absorption ◽  
Serum Calcium ◽  
Large Scale ◽  
Colorimetric Assay ◽  
Internal Standard ◽  
Reference Method ◽  
Atomic Absorption Spectrophotometry ◽  
Laboratory Model ◽  
Absorption Spectrophotometry ◽  
The Difference

Abstract Comparable results are obtained when serum calcium is measured by a colorimetric cresolpthalein method on the Technicon SMA 12/60 and by atomic absorption spectrophotometry (Instrumentation Laboratory Model 153 instrument), with strontium as an internal standard. Sera from 250 patients with abnormal calcium concentrations, ranging from 4.9 mg/100 ml to 9.0 mg/100 ml, were measured by each method; the difference between the means for each method was only 0.04 mg/100 ml. The standard deviation of the difference between paired results was ±0.16 mg/100 ml. We were unable to discover any effect of drug or disease on the colorimetric assay, which therefore is suitable for use in large-scale surveys. On the other hand, the more precise atomic absorption spectrophotometry is suitable for use as a reference method. In addition, with an internal standard it is fast and simple, making it suitable for emergency assays of calcium 24 h a day.

Determination of Soy Products in Meat-Soy Blends

1974 ◽  
Vol 57 (4) ◽  
pp. 841-846
Author(s):  
Marvin W Formo ◽  
Guy R Honold ◽  
David B Maclean
Keyword(s):  
Standard Deviation ◽  
Atomic Absorption ◽  
Computer Analysis ◽  
Coefficient Of Variation ◽  
Ground Beef ◽  
Atomic Absorption Spectrophotometry ◽  
Average Concentration ◽  
Soy Flour ◽  
Absorption Spectrophotometry

Abstract The concentrations of various elements and fiber in ground beef and textured soy flour were measured, respectively, by atomic absorption spectrophotometry and a modified AOAC fiber method. The average concentration, standard deviation, and coefficient of variation for magnesium, manganese, and fiber, respectively, in textured soy flour are 2948 mg/kg, 186 mg/kg, 6.3% ; 33.4 mg/kg, 3.4 mg/kg, 10.1% ; 2.03%, 0.27%, 13.3%. The average concentration, standard deviation, and coefficient of variation for magnesium, manganese, and fiber, respectively, in regular ground beef are 151 mg/kg, 7.4 mg/kg, 4.9% ; 0.125 mg/kg, 0.025 mg/kg, 20%; 0.01%. From computer analysis of the data from an interlaboratory study of the analysis of textured soy flour–ground beef mixtures, the expected total errors (one standard deviation in absolute percentages) of the method applied to a product containing 20% textured soy flour hvdrated 1+2 were as follows for the respective indices used: magnesium 1.8%, manganese 2.7%, and fiber 8.8%. Analysis of ground beef and textured soy flour for ash, hemicellulose, stachyose, phosphorus, potassium, copper, and zinc revealed that these constituents were not suitable indices of textured soy flour content in textured soy flour-ground beef mixtures.

Serum Copper in Schizophrenia in Nigerians

1975 ◽  
Vol 127 (2) ◽  
pp. 119-121 ◽  
Author(s):  
D. A. Olatunbosun ◽  
M. O. Akindele ◽  
B. K. Adadevoh ◽  
T. Asuni
Keyword(s):  
Atomic Absorption ◽  
Normal Control ◽  
Atomic Absorption Spectrophotometry ◽  
Serum Copper ◽  
Absorption Spectrophotometry ◽  
Control Subjects ◽  
Schizophrenic Patients ◽  
Healthy Control ◽  
The Difference ◽  
Average Serum

SummarySerum copper concentrations were determined by atomic absorption spectrophotometry in 102 schizophrenic patients and 95 healthy control subjects. The serum copper concentrations were significantly higher in the schizophrenic patients than in the normal control subjects. The average serum copper in schizophrenic females was higher than in schizophrenic males, but the difference was not statistically significant

Determination of Metals in Foodstuffs by Atomic Absorption Spectrophotometry after Dry Ashing: NMKL Interlaboratory Study of Lead, Cadmium, Zinc, Copper, Iron, Chromium, and Nickel

1993 ◽  
Vol 76 (4) ◽  
pp. 798-813 ◽  
Author(s):  
Lars Jorhem ◽  
◽  
G Afthan ◽  
G Cumont ◽  
H P Dypdahl ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Atomic Absorption ◽  
Milk Powder ◽  
Atomic Absorption Spectrophotometry ◽  
Interlaboratory Study ◽  
Absorption Spectrophotometry ◽  
Dry Ashing ◽  
Cadmium Zinc ◽  
Iron Chromium

Abstract An interlaboratory study of a method for determination of lead, cadmium, zinc, copper, iron, chromium, and nickel in foodstuffs by atomic absorption spectrophotometry (AAS) after dry ashing at 450°C was conducted in 16 laboratories. The study was preceded by a practice round of familiarization samples and another round in which solutions were distributed and the metals were determined directly by AAS. The study included 5 different foods (liver paste, apple sauce, minced fish, wheat bran, and milk powder) and 2 composite diets. A single analysis was carried out on each sample. Suitable sample combinations were used as split level combinations for determination of the repeatability standard deviation. The relative reproducibility standard deviation for each of the elements ranged as follows: lead, 74-18% at 0.025-0.28 mg/kg; cadmium, 80-11% (0.002-0.51 mg/kg); zinc, 12-7% (44- 72 mg/kg); copper, 47-10% (0.48-41 mg/kg); iron, 35-9% (2-228 mg/kg); chromium, 48-21 % (0.008- 0.22 mg/kg); nickel, 64-39% (0.025-0.39 mg/kg).

Routine Micromethod for Determination of Oxalic Acid in Urine by Atomic Absorption Spectrophotometry

1974 ◽  
Vol 20 (11) ◽  
pp. 1444-1445 ◽  
Author(s):  
R Menachè
Keyword(s):  
Oxalic Acid ◽  
Atomic Absorption ◽  
Calcium Ions ◽  
Atomic Absorption Spectrophotometry ◽  
Total Calcium ◽  
Absorption Spectrophotometry ◽  
The Difference

Abstract The method of Gitelson et al. was modified to a microscale procedure and adapted for atomic absorption spectrophotometry. Oxalic acid in urine is precipitated with excess of calcium ions at pH 5. The excess of calcium present in the supernate and the total calcium added and present in the urine at pH 2 are determined by atomic absorption spectrophotometry. The oxalic acid present in the precipitate is calculated indirectly from the difference between the two determinations of calcium. This method is useful for routine determination of urinary oxalic acid.

scholarly journals INFLUENCE OF SEVERAL RATES OF POTASSIUM FERTILIZER ON TUBER AND SOIL CONTENT AND YIELD OF SOLANUM TUBEROSUM

HortScience ◽  
1990 ◽  
Vol 25 (8) ◽  
pp. 858c-858
Author(s):  
Mack A. Wilson ◽  
Michael Aide
Keyword(s):  
Solanum Tuberosum ◽  
Atomic Absorption ◽  
Sandy Loam ◽  
Atomic Absorption Spectrophotometry ◽  
Potassium Content ◽  
Vegetable Crops ◽  
Potassium Fertilizer ◽  
Soil Potassium ◽  
Absorption Spectrophotometry

Potatoes (Solantum tuberosum) were grown on a Lilbourn sandy loam entisol in Charleston, Missouri, with varying rates of potassium fertilizer. Four rates of murate of potash (KCl) were used; 0, 196, 392 and 582 Kg-K/HA. Potassium was measured in tuber and soil by atomic absorption spectrophotometry. The amount of soil potassium was apparently high. Although potassium content in the two cultivars of potatoes, `Norchip' and `Atlantis' was slightly higher (2.3-3.7) as compared to another researcher's data (2%). Obviously, the need for potassium fertilizer for vegetable crops is related to the supplying ability of the soil. Tuber yields (Kg/HA) were higher with added rates of potassium fertilizer than the control, and the results were significant. Yields (Kg/HA) of `Atlantis' were significantly higher than `Norchip.'

scholarly journals Imobilisasi TiO2 ke dalam Resin Penukar Kation dan Aplikasinya sebagai Fotokatalis dalam Proses Fotoreduksi Ion Hg2+

2013 ◽  
Vol 3 (2) ◽  
Author(s):  
Rosyid Ridho ◽  
Endang Tri Wahyuni ◽  
Suyanta Suyanta
Keyword(s):  
Atomic Absorption ◽  
Titanium Isopropoxide ◽  
Atomic Absorption Spectrophotometry ◽  
Sulfonated Polystyrene ◽  
Exchange Method ◽  
Cold Vapor ◽  
Absorption Spectrophotometry ◽  
Cold Vapor Atomic Absorption ◽  
The Difference ◽  
Uv Lamp

Abstrak Dalam rangka mengembangkan bahan fotokatalitis TiO2 pada penelitian ini telah dilakukan preparasi fotokatalis TiO2-Resin yang disertai dengan karakterisasi dan uji aktivitas untuk proses fotoreduksi ion Hg(II). Preparasi imobilisasi ini dilakukan dengan metode pertukaran ion yang di ikuti dengan kalsinasi pada suhu tertentu. Pada preparasi telah dipelajari pengaruh konsentrasi Titanium Isopropoksida sebagai sumber ion Ti(IV) terhadap TiO2-Resin yang dikarakterisasi dengan menggunakan Difraksi Sinar X (XRD) dan Thermografimetri (TGA). Pada proses fotoreduksi ion Hg(II) dipelajari pengaruh massa fotokatalis, kadar TiO2 yang terimobilisasi ke dalam resin, konsentrasi Ion Hg(II), dan pengaruh pH. Proses fotoreduksi dilakukan dalam suatu reaktor tertutup yang dilengkapi dengan lampu UV, yaitu dengan cara menyinari campuran yang terdiri dari larutan ion Hg(II) dan serbuk fotokatalis TiO2-Resin, disertai dengan pengadukan selama waktu tertentu. Hasil fotoreduksi dihitung berdasarkan selisih antara konsentrasi ion Hg(II) awal dengan ion Hg(II) yang tak tereduksi. Penentuan konsentrasi ion Hg(II) yang tak tereduksi dilakukan dengan menggunakan Spektrofotometer Serapan Atom (SSA) teknik pembangkitan uap dingin atau Cold Vapor Atomic Absorption Spectrophotometry(CV-AAS). Hasil preparasi menunjukkan semakin tinggi konsentrasi Titanium Isopropoksida yang ditambahkan pada resin semakin tinggi juga kadar TiO2 yang terbentuk pada TiO2-Resin. Hasil uji fotokatalis menunjukkan bahwa penggunaan fotokatalis TiO¬2-Resin dapat meningkatkan hasil fotoreduksi ion Hg(II) yang peningkatannya lebih tinggi dibandingkan TiO2 serbuk. Penambahan fotokatalis dengan massa yang semakin besar menambah efektivitas fotoreduksi terhadap ion Hg(II) yang semakin besar, namun jika ditambahkan massa fotokatalis yang lebih tinggi lagi akan menurunkan efektivitas fotoreduksi terhadap ion Hg(II). Kenaikan konsentrasi Hg(II) menyebabkan efektivitas fotoreduksi semakin rendah. Pada pH 1-4 terjadi kenaikan fotoreduksi pada ion Hg(II), akan tetapi pada pH yang lebih tinggi dari 4 menyebabkan terjadinya penurunan efektivitas fotoreduksi terhadap ion Hg(II).   Kata kunci : Fotokatalis, TiO2-resin, Ion Hg(II)   Abstract To develop TiO2 photoreduction photocatalyst in order to decrease the Hg(II) ion concentrate, in this research, it has been done the TiO2-Resin photocatalyst preparation with the characterization and application to Hg(II) ion photoreduction process. This preparation was done with ion exchange method which followed by studied calcinations at certain temperature. The preparation has been studied the influence of titanium isopropoxide concentrate toward TiO2-Resin which has been characterized by using X-Ray Diffraction(XRD) and Thermografimetry (TGA). In Hg(II) ion photoreduction process, it has been studied the influence of photocatalyst mass, the content of TiO2 which immobilized into sulfonated polystyrene (resin), the ion Hg(II) concentrate, and the pH influence. The photoreduction process has been done in the closed reactor that equipped by UV lamp, and uses the irradiating a mixture which contents of Hg(II) ion solution and TiO2-Resin photocatalyst powder, with the stirring at certain time. The result of photoreduction was calculated based on the difference between the earlier Hg(II) ion concentrate and unreduced Hg(II) ion. The determining of unreduced Hg(II) ion concentrate was done by using cold vapor atomic absorption spectrophotometry (CV-AAS). The preparation result showed that the higher isopropoxide titanium that was added into sulfonated polystyrene, the higher the content of TiO2 that was formed in TiO2-Resin. the result of photocatalyst test showed that the using using of TiO2-Resin photocatalyst can increase the result of Hg(II) ion photoreduction  which the increase is higher than TiO2 powder. The added of photocatalyst by the higher mass, adds the photoreduction effectiveness toward the Hg(II) ion. The higher the Hg(II) concentrate that added, the lower the photoreduction effectiveness. In pH 1-4, there is the photoreduction increase on Hg(II) ion, but in the highest pH that more than 4, it causes the decrease of the photoreduction effectiveness toward the Hg(II) ion.   Keywords : Photocatalyst, TiO2-resin, Hg(II) ion

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