For investigation of the natural level of radioactivity, the samples of hot spring water at Misasa spa area were collected several times from June 1963 to December 1965, and concentration of ²²⁶Ra, natural U, ²²²Rn, Ca ion, Cl ion, SO₄ ion were determined. The sampling places were distributed to cover all area of spa in order to know the mean value of radioactivity level. Among those 15 sampling places, springs containing rather higher concentration of radioactive nuclides were crowded at the center part of Misasa area, corresponding to the north side of Santoku river. Besides, the concentration of ²²⁶Ra in spring water was far higher than the radioactive equilibrium value calculated from the content of natural U. The habitants in this area have a custom to drink the spring water usually, so hygienic problem was discussed comparing the maximum permissible concentration recommended by ICRP and NBS in the USA conveniently. The mean value of natural U was 2 μg/liter, and that of ²²⁶Ra was 5.4 pCi/liter. Comparing with 1/30 of the maximum permissible concentration in water for occupational people which was recommended by ICRP, the concentration of natural U was much lower, but the value of ²²⁶Ra was near to 1/30 of recommended concentration. The mean value of the concentration of ²²⁶Rn in spring water was 1.5×10^-2 μCi/liter and much higher than 1/30 of the maximum permissible concentration recommended by NBS.

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The natural radioactive nuclides in the spring water at Masutomi spa area were investigated in order to consider the safety for drinking. The samples of spring water were collected from 12 places of Masutomi spa area in 1963, and from 6 places in 1964 and 1965. The mean value of concentration of ²²⁶Ra was 21.7 pCi/liter and that of ²²²Rn was 1.3×10^-2 μCi/liter at 6 sampling places where the water was used for drinking. The contents of natural U were very little generally and the maximum value of its concentration was 2.3 μg/liter among 2 times determination at 6 places. Comparing with 1/30 of the maximum permissible concentration in water for occupational people which was recommended by ICRP and NBS in the USA, the found values of concentration of ²²⁶Ra and ²²²Rn were much higher, while that of natural U was much lower. Considering the above mentioned results, it should be recommended that the mean daily intakes of spring water shall be less than 300 ml based on ²²⁶Ra content, whereas 150 ml on ²²²Rn content.

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Colorimetric determination of acetanilide in mixed pharmaceutical preparations was examined, and a new method with high accuracy and selectivity was established. Acetanilide was hydrolysed by refluxing with hydrochloric acid to produce aniline which reacts with sodium nitrate in an acid medium to form a diazonium compound. Coupling of the resulting diazonium compound with β-diethylaminoethyl-α-naphthylamine oxalate produced red dye. The diazo dye had an absorption maximum at 560 mμ. Interference by the presence of acetaminophen, nicotinoyl-4-aminoantipyrine, antipyrine, and aminopyrine can be eliminated by chloroform extraction in an acid medium. This method of determination is not interfered by the presence of phenacetine acetylsalicylic acid, caffeine, diphenhydramine hydrochloride, chlorophenilamine maleate, ethoxybenzamide, ephedrine hydrochloride, etc.

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Colorimetric determination of phenacetine in mixed pharmaceutical preparations was examined and a new method with high accuracy and selectivity was established. Phenacetine was hydrolysed by refluxing with hydrochloric acid to produce p-phenetidine which reacts with sodium nitrate in an acid medium to from diazonium compound. Coupling of the resulting diazonium compound with β-diethylaminoethyl-α-naphthylamine oxalate produced blue dye. The diazo dye had an absorption maximum at 595 mμ. Interference by the presence of acetaminophen, nicotinoyl-4-aminoantipyrine, antipyrine, and aminopyrine can be eliminate by chloro- form extraction in acid medium.

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Dose rates of external radiation were measured with an ionization chamber equiped with ivibrating reed electrometer at some spots in Misasa and Masutomi spa areas which are called strong radioactive fountains in Japan. At Misasa spa area, the maximum value of 25.0 μR/hr was recorded in a bath room, and the minimum value was 13.0 μR/hr in field. The maximum value recorded at Masutomi spa area was 24.5 μR/hr in a bath room, and minimum one recorded in a garden of hotel was 5 μR/hr, which was equal to the average value measured in Tokyo. If the habitants in these spa area are assumed to take a bath every day and stay in the bath room for 30 minutes, it can be said that their radiation dose rates might amount to 116 mR/year at Misasa and 48 mR/year at Masutomi.

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The water quality of a brackishe lake (the Kasumigaura) was investigated at the flesch-water areas wherein rivers polluted by industrial waste and domestic sewage flowed. The sampling stations were settled at one point in every six rivers and eight points of the lake (as shown in Fig. 1). The following results were obtained. 1. In the rivers flowing through cities and towns, water qualities were influenced by the amount of rainfall on the sampling day. 2. BOD loading of the river polluted by industrial waste and domestic sewage was increased in summer. 3. The contamination of lake water near to the lake side was consequent on flow of polluted river water. These polluting substances were diffused with windows or waves.

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The paper electrophoretic method for separation and identification of monobasic n-saturated lower fatty acids (C₁ to C₁₀) was investigated. The fatty acids were separated by using 3% aqueous ammonia or the tenfold diluted of Atkins-Pantin buffer solution (pH 10) as electrolytes, and detected by staining with bromocresol green and bromothymol blue. For the electrolytes, 3% aqueous ammonia was superior to the Atkins-Pantin buffer solution in the separation of propionic and butyric acids, or caprylic and pelargonic acids.

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Stack gas containing phenol and cresols was passed into 0.1 N sodium hydroxide solution, and the solution was acidified with 5 N sulfuric acid, extracted with ether. The ether layer was analyzed by gas chromatography with hydrogen flame ionization detector on a 3 m Dioctyl Sebsate (30%) column at 152°. The flow rate was 70 ml/min of nitrogen, 60 ml/min of hydrogen and 1.0 liter/min of air. Phenol and cresols were removed efficiently by washing waste gas with water or sodium hydroxide solution in a washing column packed with rashig rings.

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