Ion Exchange Determination of Strontium-89 and Strontium-90 in Milk: Collaborative Study

1973 ◽  
Vol 56 (1) ◽  
pp. 213-218
Author(s):  
Edmond J Baratta ◽  
F E Knowles
Keyword(s):  
Nitric Acid ◽  
Ion Exchange ◽  
High Precision ◽  
Collaborative Study ◽  
Accuracy Estimation ◽  
High Side ◽  
Strontium 90 ◽  
Precision And Accuracy

Abstract A method for the determination of strontium-89 and strontium-90 in milk, involving ion exchange and purification with nitric acid, was evaluated by 11 collaborators. The accuracy of the method for strontium-89 ranged from 2 to 56% and the within-laboratory precision ranged from 11 to 76% for a concentration range of 68–480 pCi/L; values for strontium-90 in a concentration range of 50.2–116.2 pCi/L were 6.4 to 10 and 4 to 11%, respectively. The slight bias on the high side for strontium-90 was not considered serious. The collaborators had difficulty with strontium-89 analyses, as shown by the high precision and accuracy estimation values.

Determination of Strontium-90 in Water: Collaborative Study

1973 ◽  
Vol 56 (1) ◽  
pp. 208-212
Author(s):  
Edmond J Baratta ◽  
F E Knowles
Keyword(s):  
Nitric Acid ◽  
Collaborative Study ◽  
Carbonate Precipitation ◽  
Laboratory Techniques ◽  
Individual Laboratory ◽  
Strontium 90 ◽  
Yttrium 90

Abstract A procedure involving carbonate precipitation and purification with nitric acid was evaluated by 11 collaborators for the determination of strontium-90 in water. The ingrowth level of yttrium-90 is counted and this activity is used to calculate the strontium-90 activity present. The accuracy of the method ranged from 9 to 16% and within-laboratory precision ranged from 13 to 19% for strontium-90 levels of 28.2 to 99.6 pCi/L. A slight bias on the low side, caused by individual laboratory techniques, was not considered serious. The method has been adopted as official first action.

Ion Exchange Determination of Strontium-89 and Strontium-90 in Milk: Collaborative Study

1974 ◽  
Vol 57 (1) ◽  
pp. 37-38
Author(s):  
Edmond J Baratta
Keyword(s):  
Standard Deviation ◽  
Ion Exchange ◽  
Collaborative Study ◽  
Exchange Method ◽  
Strontium 90 ◽  
Ion Exchange Method ◽  
Cent Error

Abstract Eleven collaborators performed a second collaborative study of an ion exchange method for determining strontium-89 and -90. For milk containing 29.0 and 197 pCi/L of strontium- 89, the results at 2 levels were: average 31.0, 199.6; range 26-36, 164-290; standard deviation 2.9, 7.2; and per cent error 10.0, 3.4. For milk containing 32.4 and 151.2 pCi/L of strontium-90, the results were: average 32.5, 149.9; range 27.2-38.0, 125.3-170.3, standard deviation 0.32, 4.17; and per cent error 0.9, 2.8. The method has been adopted as official first action.

Collaborative Study of the Gas-Liquid Chromatographic Method for Determination of Stereochemical Composition of Amphetamine

1972 ◽  
Vol 55 (1) ◽  
pp. 146-148
Author(s):  
Clyde E Wells
Keyword(s):  
Column Chromatography ◽  
Chromatographic Method ◽  
Collaborative Study ◽  
Good Precision ◽  
Liquid Chromatographic Method ◽  
Precision And Accuracy ◽  
Standard Deviations ◽  
Liquid Chromatographic ◽  
Amphetamine Sulfate

Abstract Eight laboratories collaboratively studied a method for the quantitative GLC determination of d- and l-amphetamine in tablets. The drugs are separated from tablet excipients by column chromatography and reacted with Ntrifluoroacetyl-( 0-prolyl chloride, and the resulting derivatives are analyzed by GLC. The samples consisted of commercial d-amphetamine sulfate tablets (with and without butabarbital), dl-amphetamine sulfate tablets, and a mixed d- and l-amphetamine sulfate standard. Recoveries were acceptable, and the standard deviations never exceeded 0.64%. The results demonstrate that the method gives good precision and accuracy, and the method is recommended for adoption as official first action.

Collaborative Study of a Zincon Ion Exchange Method for the Quantitative Determination of Zinc in Fertilizers

1971 ◽  
Vol 54 (4) ◽  
pp. 790-795
Author(s):  
C E Jones ◽  
L E Pracht
Keyword(s):  
Ion Exchange ◽  
Quantitative Determination ◽  
Atomic Absorption ◽  
Reference Data ◽  
Collaborative Study ◽  
Present Form ◽  
Exchange Method ◽  
Ion Exchange Method ◽  
Absorption Measurements

Abstract This collaborative study represents an attempt to validate the ion exchange zincon method for the quantitative determination of zinc in fertilizers. The values of the standard deviations Sd, Sr, and Sb and the results of the F- and t-tests are presented as an estimate of the precision, accuracy, and dependability. Atomic absorption measurements were also made and provided reference data for evaluation purposes. In its present form, the method falls short of expectations as an alternative wet approach to the dithizone method. It is recommended that the methods for determining zinc in fertilizers be studied further.

Ion Exchange Method for the Separation and Spectrophotometric Determination of Some Sympathomimetic Amines, Antihistamines, and Phenothiazines in Pharmaceuticals

1972 ◽  
Vol 55 (3) ◽  
pp. 596-609
Author(s):  
Donald J Smith
Keyword(s):  
Ion Exchange ◽  
Collaborative Study ◽  
Atropine Sulfate ◽  
Codeine Phosphate ◽  
Chlorpheniramine Maleate ◽  
Sulfonated Polystyrene ◽  
Exchange Method ◽  
Polystyrene Resin ◽  
Acidic Compounds

Abstract An ion exchange procedure has been developed for the separation and quantitative analysis of 32 drugs in various combinations: (a) promethazine HCl with codeine phosphate and potassium guaiacolsulfonate; (b) phenylephrine or phenylpropanolamine HCl with (1) dextromethorphan HBr, potassium guaiacolsulfonate, chlorpheniramine maleate, and/or pyrilamine maleate; (2) dextromethorphan HBr, glyceryl guaiacolate, chlorpheniramine maleate, and/or pyrilamine maleate; (3) dextromethorphan HBr and potassium guaiacolsulfonate; (4) dextromethorphan HBr and glyceryl guaiacolate; (5) dextromethorphan HBr and antihistamine; (6) antihistamine and glyceryl guaiacolsulfonate; (7) antihistamine and potassium guaiacolsulfonate; (8) dextromethorphan HBr; (9) glyceryl guaiacolate; (10) potassium guaiacolsulfonate; (c) promethazine HCl with (1) codeine phosphate or (2) phenylephrine HCl; (d) codeine phosphate and potassium guaiacolsulfonate; (e) chlorpromazine HCl, promazine HCl, or promethazine HCl; (f) phenylephrine HCl; (g) codeine phosphate; (h) perphenazine HCl alone or with amitriptyline HCl; (i) ephedrine sulfate with phenobarbital, theophylline, and glyceryl guaiacolate; (j) l-epinephrine bitartrate alone or with antihistamine; (k) procaine HCl, procainamide HCl, procaine isobutyrate, or tetracaine HCl; (l) quinine sulfate with aminophylline; (m) dextromethorphan HBr with (1) terpin hydrate; (2) antihistamine; (3) potassium guaiacolsulfonate; (4) glyceryl guaiacolate; and (n) atropine sulfate or honiatropine methylbromide. The nitrogenous bases are separated from the excipients by retention on a sulfonated polystyrene resin column. These basic compounds are eluted from the column with the appropriate concentration of HCl and are determined by UV; absorption. The organic acids are retained on the quaternary ammonium anion resin. The acidic compounds are eluted from the columns with the appropriate concentration of HCl and determined by I’V absorption. Average recoveries ranged from 98.6 to 101% in the absence of excipients and 95.8 to 102% with excipients present. The method is recommended for collaborative study.

scholarly journals Fraksisanasi dan distribusi keterikatan seng dalam sedimen Sendang Biru menggunakan metode BCR sonifikasi (The Bureau Community Of Reference)

2021 ◽  
Vol 2 (2) ◽  
pp. 95-99
Author(s):  
Miftachul huda putra pratama ◽  
Anugrah Ricky Wijaya ◽  
Irma Kartika Kusumaningrum
Keyword(s):  
Heavy Metals ◽  
Ion Exchange ◽  
High Precision ◽  
Residual Fraction ◽  
Anthropogenic Activity ◽  
Important Method ◽  
Bcr Method ◽  
Blue Fish ◽  
Precision And Accuracy ◽  
Zinc Levels

The density of anthropogenic activity in the port of blue fish leads to the contribution of heavy metals in sediments. The method of leaching is an important method to dissolve all zinc in the sediment precision and accuracy. Research on zinc levels in sediments has been widely practiced, but fractionation and distribution of zinc attachment in Blue Spring sediment using BCR Sonification. The results of the zinc analysis using BCR Sonification method gave precision value of 0.49 percent, and accuracy of 91.20 percent, the results showed that BCR method has high precision and accuracy value. The fractionation of zinc metal in the sediments shows that zinc is dominant in non-resistant (1) fractions comprising an ion exchange fraction, (2) carbonate bound fraction, (3) reduction fraction and (3) an oxidation fraction with a percentage of 10.16 percent; 23.52 percent; 21.25 percent. Whereas in the fraction resistant or residual fraction the concentration of zinc in the sediment was 45.07%. The distribution of zinc levels in sediments at nine locations in Sendang Biru ranged from 36.6 mg/kg - 239,78mg/ kg indicating that the Blue Sendang sediment was partly contaminated from anthropogenic because the zinc levels had exceeded the ereference of 120 mg/ kg. Padatnya kegiatan antropogenik di pelabuhan ikan sendang biru menyebabkan adanya kontribusi seng dalam sedimen. Metode leaching merupakan metode yang penting untuk melarutkan semua seng dalam sedimen secara presisi dan akurasi. Penelitian kadar seng dalam sedimen telah banyak dilakukan, tetapi fraksinasi dan distribusi keterikatan seng dalam sedimen Sendang Biru menggunakan metode BCR Sonifikasi. Hasil penelitian analisis seng menggunakan metode BCR Sonifikasi memberikan nilai presisi sebesar 0,49 persen, dan akurasi sebesar 91,20 persen, hasil tersebut menunjukkan bahwa metode BCR memiliki nilai presisi dan akurasi yang tinggi. Fraksinasi logam seng dalam sedimen menunjukkan bahwa seng dominan pada fraksi non resisten yang terdiri dari fraksi (1) pertukaran ion, (2) fraksi terikat karbonat, (3) fraksi reduksi, dan (4) fraksi oksidasi dengan presentase sebesar 10,16 persen; 23,52 persen; 21,25 persen, sedangkan pada fraksi resisten atau fraksi residu konsentrasi seng dalam sedimen adalah 45,07 persen. Distribusi kadar seng dalam sedimen pada sembilan lokasi di Sendang Biru berkisar antara 36,6mg/kg - 239,78mg/kg. Hal ini menunjukkan bahwa sedimen Sendang Biru sebagian terkontaminasi dari antropogenik dengan kadar melebihi ambang batas yaitu sebesar 120 mg/kg.

Collaborative Study of the Determination of Morphine in Paregoric

1968 ◽  
Vol 51 (6) ◽  
pp. 1315-1318
Author(s):  
Edward Smith
Keyword(s):  
Chromatographic Method ◽  
Collaborative Study ◽  
Good Precision ◽  
Uv Absorbance ◽  
Opium Alkaloids ◽  
Precision And Accuracy ◽  
High Degree

Abstract A partition chromatographic method for the determination of morphine in paregoric and other opium preparations was subjected to collaborative study. The morphine is separated from associated opium alkaloids by successive elution through consecutive acidic and alkaline columns and is measured by UV absorbance. The isolated morphine was shown to have a high degree of purity. The method is rapid and the results of the collaborative study show good precision and accuracy. The method is recommended for adoption as official, first action.

Collaborative Study of the Determination of uric Acid in Flour

1967 ◽  
Vol 50 (4) ◽  
pp. 776-781
Author(s):  
N P Sen
Keyword(s):  
Uric Acid ◽  
Collaborative Study ◽  
Enzymatic Method ◽  
Reasonable Range ◽  
The Mean ◽  
Precision And Accuracy

Abstract A collaborative study of an enzymaticultraviolet method for determining uric acid in flour was made by 10 laboratories on 3 flour samples containing varied proportions of infested flour and one sample containing a known amount of added uric acid. The mean recovery of the added uric acid (16.91 mg/100 g) was 103%. The precision and accuracy of the collaborative results were within reasonable range for an enzymatic method.

Sign in / Sign up

Export Citation Format

Share Document