Determination of Formaldehyde by the 4-Amino-3-hydrazino-5-mercapto-1, 2, 4-triazol Method (AHMT Method)

春雄, 三村; 幹宏, 金子; 信一, 西山; 昭三, 福井; 三郎, 菅野

doi:10.1248/jhs1956.22.39

Cited by 8 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Preliminary experiments were conducted to find out whether any detectable surface alteration would be produced on pollucite upon exposure to synthetic groundwater containing (in terms of mg·dm- 3 ) 0.400 NHt, 117 Na+, 4.99 K+, 10.3 Mg 2 +, 42.6 Ca2+, 0.501 Mn2+. 2.00F-, 95.1Cl-, 252HC03, 15.0SOL 38.0 Si08, 0.100 NO;, 0.500 NOs-, 0.100 PO!-and presenting an alkalinity of pH 8.8.…”

Section: Resultsmentioning

confidence: 99%

Surface Alteration of Pollucite under Hydrothermal Conditions

Mimura¹,

Shibata²,

Akiba³

1990

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

In connection with studies for evaluating the leachability of Cs from solidified radioactive waste, the surface alteration of pollucite was studied under hydrothermal conditions. Pollucite exposed to NaCI or KCI at 300oC formed on its surface a precipitate phase of analcime in the case of NaCI or leucite in the case of KCI. Cuba-octahedral analcime built up not only on the outermost surface of sample but also in the altered layer underneath. This crystal penetration was attributed to precipitation and isomorphous substitution of Na by Cs in the pollucite. The leachability of Cs proved to increase in keeping with salt concentration.Exposure to CaCI 2 or to MgCI 2 formed a thick precipitate layer of anorthite in the case of CaCI 2 or clinochlore in the case of MgCI 2 over a thin reaction layer. This precipitate layer had the effect of inhibiting the migration of Cs. Si and AI to restrain Cs leaching into solution, which caused the amount of Cs leached to level off beyond 0.01 mol·dm-3 salt concentration in the case of CaCI •. and beyond 0.1 mol·dm-• in the case of MgCI •.

show abstract

Section: Resultsmentioning

confidence: 99%

Surface Alteration of Pollucite under Hydrothermal Conditions

Mimura¹,

Shibata²,

Akiba³

1990

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

show abstract

“…3. Higher values of Kd were obtained for zeolites with large pore sizes ; for example, L zeolite with a pore size of 7.8 A< 10 l has the largest value of 1.2Xl0 4 • L zeolite has also a high Kd value of 3.5x10 4 for Eu3+ 01 l. The ion exchange of hydrated AmS+ in zeolites much depends on their pore sizes, that is, ion sieve effect acts more strongly on hydrated Am"+ in zeolites having smaller pore size. Attempts were made to find the relation between Kd values and some…”

Section: Adsorption Behaviormentioning

confidence: 96%

Adsorption Behavior of Americium on Zeolites

Mimura

ISHIHARA

Akiba

1991

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

Zeolites are expected to be used in buffer materials as an admixture to bentonite to increase their ion exchange ability. The behavior of ion exchange adsorption of Am3+ on various zeolites was examined by batch and column methods. The distribution coefficient of Am 3 +, Kd, increased with equilibrium pH from 1.5 to 4.0. L zeolite and mordenite having large pore size yielded relatively large values of K d over 10 3 at pH 3.0. The K d for L zeolite was unaffected by the concentration of coexisting cations, i.e. Na+ up to 0.1 M, and K+, Ca 2 + and Mg2+ less than 0.01 M. The Am3+ ion was not detected in the effluent passed through the L zeolite column up to 90 bed volumes, even when the feed solution contained a relatively large amount of Na+-0.5 M. Americium ion adsorbed on zeolites could be quantitatively eluted with 0.1 M nitric acid.

show abstract

“…Predehyde, colors obtained from glycoaldehyde, glyceralviously published reports have favorably compared the dehyde, and threose are only 40, 17, and 7%, respecsensitivity of formaldehyde determination by Purpald tively. As discussed below, larger aldehydes which are to that by the CTA assay and acetaldehyde (7). When predicted to be produced during periodate oxidation of formaldehyde was analyzed in parallel by CTA and carbohydrates do not appear to contribute to extranePurpald in the test tube format (Figs.…”

Section: Measurement Of 10-50 Nmol Formaldehyde Is Per-mentioning

confidence: 97%

“…The chromotropic acid pald (4-amino-3-hydrazino-5-mercapto-1,2,4-triazole) has method requires heating of the sample under strongly been used for formaldehyde determination, and is more acidic conditions, which is undesirable in many appli-sensitive than other methods such as those using acetylcations. The acetylacetone method yields a yellow acetone or CTA (2,7,8). In the reaction of Purpald with color product, and is less specific and sensitive (Mi-formaldehyde, the adduct of Purpald and formaldehyde We found dilute periodate to be compatible with the opment with the Purpald reagent.…”

mentioning

confidence: 88%