JPH02151764A - Method for deciding benzotriazol concentration in cooling water - Google Patents
Method for deciding benzotriazol concentration in cooling waterInfo
- Publication number
- JPH02151764A JPH02151764A JP30612688A JP30612688A JPH02151764A JP H02151764 A JPH02151764 A JP H02151764A JP 30612688 A JP30612688 A JP 30612688A JP 30612688 A JP30612688 A JP 30612688A JP H02151764 A JPH02151764 A JP H02151764A
- Authority
- JP
- Japan
- Prior art keywords
- amount
- concentration
- benzotriazol
- benzotriazole
- copper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000000498 cooling water Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 8
- 239000010949 copper Substances 0.000 claims abstract description 34
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052802 copper Inorganic materials 0.000 claims abstract description 22
- 239000002244 precipitate Substances 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 239000012964 benzotriazole Substances 0.000 claims description 32
- 239000007864 aqueous solution Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 abstract description 6
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 10
- 125000005605 benzo group Chemical group 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 150000001879 copper Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000012088 reference solution Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000012086 standard solution Substances 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000009474 immediate action Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
本発明は、銅または調合金製の配送系中の冷却水中の防
錆剤ベンゾトリアゾールの濃度の判定方法に関し、
現地にて短時間で簡単にベンゾトリアゾール濃度を判定
できる方法を提供することを目的とし、所定濃度のベン
ゾ） ＩＪアゾール水溶液の一定量に含まれるベンゾ）
ＩＪアゾールと過不足無く反応して沈殿物Ｃ１（Ｃｓ
Ｈ＜Ｎｓ） ２を生成させる量の銅を含有しかつｐＨ７
〜８に調整された銅含有水溶液に、ベンゾトリアゾール
濃度が未知の冷却水を上記−定量と等しい量で加え、得
られた沈殿物の量を、上記過不足ない反応で得られる沈
殿物［ｕ （Ｃ８８４Ｌ） ２の量と目視で比較するよ
うに構成する。[Detailed Description of the Invention] [Summary] The present invention relates to a method for determining the concentration of benzotriazole, a rust inhibitor, in cooling water in a delivery system made of copper or a prepared alloy. The purpose is to provide a method that can determine the concentration of benzo (benzo at a given concentration) (benzo contained in a certain amount of IJ azole aqueous solution)
Precipitate C1 (Cs
H<Ns) containing an amount of copper to form 2 and having a pH of 7
Cooling water with an unknown benzotriazole concentration is added to the copper-containing aqueous solution adjusted to 8. (C884L) Constructed to visually compare with the amount of 2.
本発明は、銅または調合金製の配送系内の冷却水中に存
在する防錆剤ベンゾ） ＩＪアゾール（Ｃ６１（ＳＮ３
）の濃度を簡便に判定する方法に関する。The present invention uses a rust inhibitor (benzo) IJ azole (C61 (SN3
) relates to a method for easily determining the concentration of
近年、高度情報化時代の進展に伴い、超大型コンピュー
タに対する処理能力向上の要求はますます増加の一途を
たどり、半導体素子も高密度かつ高集積化している。こ
のため半導体素子１個当たりの発熱量も大幅に増大し従
来の空冷方式から冷却能力の高い水を媒体とした伝導冷
却方式に代わって来ている。In recent years, with the progress of the advanced information age, the demand for improved processing power in ultra-large computers has been increasing, and semiconductor devices have also become denser and more integrated. For this reason, the amount of heat generated per semiconductor element has increased significantly, and the conventional air cooling method has been replaced by a conduction cooling method using water as a medium with high cooling capacity.
冷却水の循環系には銅および銅合金の配管や部品等も使
われており、この防食を目的にベンゾトリアゾールが使
用されている。防錆効果を維持するためにも、ベンゾト
リアゾールの濃度チエツクは必須となっている。Copper and copper alloy piping and parts are also used in the cooling water circulation system, and benzotriazole is used to prevent corrosion. In order to maintain the rust prevention effect, it is essential to check the concentration of benzotriazole.
従来、ベンゾトリアゾールの濃度チエツクは、ユーザの
冷却システムから冷却水を採取し、これを分析センタに
送付し、ベンゾトリアゾールの紫外線吸収を吸光光度計
にて分析を行っていた。Conventionally, to check the concentration of benzotriazole, cooling water was collected from the user's cooling system, sent to an analysis center, and the ultraviolet absorption of benzotriazole was analyzed using an absorption photometer.
そのため、冷却水中のベンゾ） ＩＪアゾール濃度が判
明するのに長期間を要し、ベンゾトリアゾールが不足し
ている場合でもすぐ対応がとれず鋼管や銅部品が腐食し
水洩れが発生する危険性を持っていた。Therefore, it takes a long time to determine the concentration of benzotriazole in the cooling water, and even if there is a shortage of benzotriazole, immediate action cannot be taken, increasing the risk of corroding steel pipes and copper parts and causing water leaks. had.
本発明は、現地にて短時間で簡単にベンゾトリアゾール
濃度を判定できる方法を提供することを目的とする。An object of the present invention is to provide a method for easily determining benzotriazole concentration on-site in a short time.
上記の目的は、本発明によれば、所定濃度のベンゾトリ
アゾール水溶液の一定量に含まれるベンゾトリアゾール
と過不足無く反応して沈殿物Ｃｕ （Ｃｓｌ’１ｓＮ３
） ２を生成させる量の銅を含有しかつｐＨ７〜８に調
整された銅含有水溶液に、ベンゾトリアゾール濃度が未
知の冷却水を上記一定量と等しい量で加え、得られた沈
殿物の量を、上記過不足ない反応で得られる沈殿物Ｃｕ
（Ｃ６Ｈ４Ｎ３） ２の量と目視で比較することを特
徴とする、冷却水中のベンゾトリアゾール濃度の判定方
法によって達成される。According to the present invention, the above object is achieved by reacting with benzotriazole contained in a certain amount of an aqueous solution of benzotriazole at a predetermined concentration in just the right amount to form a precipitate Cu (Csl'1sN3
) To a copper-containing aqueous solution containing copper in an amount to produce 2 and adjusted to pH 7 to 8, add cooling water of unknown benzotriazole concentration in an amount equal to the above fixed amount, and calculate the amount of precipitate obtained. , the precipitate Cu obtained by the above reaction in just the right amount
This is achieved by a method for determining the concentration of benzotriazole in cooling water, which is characterized by visually comparing it with the amount of (C6H4N3)2.
本発明では、ベンゾトリアゾールと銅との反応生成物Ｃ
ｕ （Ｃ６）ＩＳＮ３） ２の沈殿物の量を目視判定す
る。In the present invention, the reaction product C between benzotriazole and copper
u (C6)ISN3) Visually judge the amount of precipitate in 2.
冷却水には、防錆効果を長期間維持するために所定濃度
になるようにベンゾｌ−ＩＪアゾールが添加される。こ
の所定濃度は、冷却水の使用期間中にベンゾトリアゾー
ルが徐々に消耗してベンゾトリアゾール濃度がある程度
低下しても防錆効果を確保できるように設定されており
、通常、１１０００ｐｐ程度である。この所定濃度でベ
ンゾトリアゾールを含有する水溶液を基準溶液とし、こ
れを作業上適当な一定量（たとえば数ｃｃ）準備する。Benzol-IJ azole is added to the cooling water at a predetermined concentration in order to maintain the anti-rust effect for a long period of time. This predetermined concentration is set so that the rust prevention effect can be ensured even if the benzotriazole concentration decreases to some extent due to gradual consumption of benzotriazole during the period of use of the cooling water, and is usually about 11,000 pp. This aqueous solution containing benzotriazole at a predetermined concentration is used as a reference solution, and a certain amount (for example, several cc) suitable for the work is prepared.
この一定量中の基準溶液中に含まれるベンゾトリアゾー
ルＣＢ１１５Ｎ３と過不足無く反応して沈殿物Ｃｕ （
Ｃ６Ｈ５Ｎ３） ２を生成する銅のｍｏｌ数は、コノ化
学式から、ベンゾトリアゾールのｍｏｌ数の１／２であ
る。このような量を含有するように濃度と容量を設定し
かつＩ）８７〜８に調整した銅含有水溶液を準備する。This precipitate Cu (
From the Kono chemical formula, the mol number of copper that produces C6H5N3) 2 is 1/2 of the mol number of benzotriazole. A copper-containing aqueous solution whose concentration and volume are set so as to contain such an amount and which is adjusted to I) 87 to 8 is prepared.
ｐＨ７〜８は、ベンゾトリアゾールと銅が反応して生成
物が沈殿するために適した範囲である。ｐＨ調整は、酒
石酸、酢酸塩溶液等で行うと便利である。pH 7 to 8 is a suitable range for benzotriazole and copper to react and the product to precipitate. It is convenient to adjust the pH using tartaric acid, acetate solution, or the like.
この銅含有水溶液に、ベンゾｌ−’Ｊアゾール濃度不明
の使用中の冷却水を採取して加える。加える量を、上記
基準溶液について設定した一定量と等しい量にすること
によって、冷却水中に残存するベンゾトリアゾール濃度
に比例した量のＣｕ （Ｃ６Ｈ５Ｎ３） ２が沈殿する
。この沈殿物は緑色の微粉として生成するため、基準溶
液で生成させた沈殿状態（標準サンプル）と目視で容易
に比較できる。予め種々のレベルの既知濃度のベンゾト
リアゾール水溶液と上記の銅含有水溶液とを反応させた
標準サンプル群を用意しておき、それぞれの沈殿量と比
較することにより、必要に応じた精度で冷却水のベンゾ
トリアゾール濃度を判定することができる。Cooling water in use with an unknown concentration of benzo l-'J azole is collected and added to this copper-containing aqueous solution. By making the amount added equal to the constant amount set for the reference solution, an amount of Cu (C6H5N3) 2 is precipitated that is proportional to the benzotriazole concentration remaining in the cooling water. Since this precipitate is produced as a green fine powder, it can be easily visually compared with the precipitate state produced in the standard solution (standard sample). Prepare a group of standard samples in advance by reacting benzotriazole aqueous solutions with known concentrations at various levels with the above copper-containing aqueous solution, and compare the amount of precipitation for each to determine the amount of cooling water as needed. Benzotriazole concentration can be determined.
本発明は、冷却システムの設置されている現地で簡便に
ベンゾトリアゾール濃度を判定できる。The present invention allows benzotriazole concentration to be easily determined at the site where the cooling system is installed.
そのために、数レベルの沈殿量の標準サンプル群と銅含
有水溶液とを現地まで携帯する必要がある。For this purpose, it is necessary to carry a group of standard samples with several levels of precipitation and an aqueous solution containing copper to the site.
標準サンプルは、たとえば容量１〇−程度の小型試験管
で準備しておけば携帯するのに便利である。沈殿物は液
中に微粉として懸濁状態で浮遊しており、液容器の底部
に沈積するには長時間を要する。これを利用して、既知
のペンゾトリアゾール濃度で生成した沈殿物の緑色の懸
濁状態に対応した色を紙等に印刷して色見本として携帯
すれば、液状の標準サンプル自体を携帯するよりも極め
て便利である。It is convenient to carry the standard sample if it is prepared in a small test tube with a capacity of, for example, about 10 liters. The precipitate is suspended in the liquid as a fine powder, and it takes a long time for it to settle at the bottom of the liquid container. Taking advantage of this, if you print a color corresponding to the green suspension state of the precipitate produced at a known concentration of penzotriazole on paper and carry it with you as a color sample, it is easier to carry the liquid standard sample itself. is also extremely convenient.
更に、本発明では銅含有水溶液の代わりに、これを蒸発
乾固させた固形物を用いることができる。Furthermore, in the present invention, a solid material obtained by evaporating the copper-containing aqueous solution to dryness can be used instead of the copper-containing aqueous solution.
現地でこの固形物に、採取した冷却水を所定量加えるこ
とにより、銅含有水溶液に加えた場合と同様の沈殿反応
が起きるので、銅含有水溶液を用いた場合と同様に判定
を行える。By adding a predetermined amount of the collected cooling water to this solid on site, a precipitation reaction similar to that occurring when it is added to a copper-containing aqueous solution occurs, so that judgments can be made in the same way as when using a copper-containing aqueous solution.
色見本と上記の固形物とを用いれば、液体を一切携帯す
る必要がなくなるので、実作業上極めて有利である。Using a color sample and the above-mentioned solid material eliminates the need to carry any liquid with you, which is extremely advantageous in actual work.
本発明では、冷却水のベンゾトリアゾール濃度に比例し
た沈殿量を利用するので、目視によって濃度判定するこ
とができる。In the present invention, since the amount of precipitation is used which is proportional to the benzotriazole concentration in the cooling water, the concentration can be determined visually.
以下に、実施例によって本発明を更に詳しく説明する。The present invention will be explained in more detail below with reference to Examples.
実施例１
純度９９．９９％の金Ｒ銅１ｇを精秤し、ＨＣｌ−ＨＮ
Ｏ３で加熱溶解、乾固近くまで加熱を続け、放冷後１１
ｃβを８４ｄ加え純水で１βとした（Ｃｕ １１０００
ｐｐのｌＮＨＣＮ溶液）。この代わりに、市販の原子吸
光用標準溶液を用いてもよい。Example 1 1 g of gold R copper with a purity of 99.99% was accurately weighed, and HCl-HN
Dissolve by heating with O3, continue heating until almost dry, and leave to cool for 11 days.
Add 84d of cβ and make 1β with pure water (Cu 11000
pp of 1NHCN solution). Instead, a commercially available standard solution for atomic absorption may be used.
この溶液２６７ｒｎｌを採り、酢酸ナトリウムでｐＨ７
，５に調整し純水で１ｐとした（２６７ｐｐｍ Ｃｕ溶
液ｐＨ７，５）。Take 267 rnl of this solution and adjust the pH to 7 with sodium acetate.
, 5 and made 1p with pure water (267 ppm Cu solution pH 7.5).
これを１０ｍ１入りの栓付き試験管に４ｍｊ’入れたも
のを３本準備した。Three 10 ml test tubes containing 4 mj' of this with a stopper were prepared.
ベンゾトリアゾール濃度１１００ｐｐ、 ５００ｐｐｍ
、 １１０００ｐｐの水溶液を、準備した試験管に入れ
、沈殿を作り、これを標準サンプルとし、同様の試料を
もう１組作り、５人で判定したところ、いずれの人も正
しく判定した。Benzotriazole concentration 1100pp, 500ppm
, 11,000 pp aqueous solution was put into a prepared test tube to form a precipitate.This was used as a standard sample.Another set of similar samples was made and judged by five people, all of whom judged correctly.
実施例２
実施例１のｐＨ７，５の銅溶液４−を加熱乾燥して水分
を取り除き、粉末状としたものを試験管に採取した。こ
れを６本準備し、実施例１と同様の方法で試験を行った
結果、実施例１と同様の結果が得られた。Example 2 The copper solution 4- of pH 7.5 of Example 1 was heated and dried to remove moisture, and the powder was collected in a test tube. Six pieces of this were prepared and tested in the same manner as in Example 1, and the same results as in Example 1 were obtained.
銅の粉末状塩としては、硫酸銅や酢酸銅等の使、用も可
能である。As the powdered copper salt, it is also possible to use copper sulfate, copper acetate, and the like.
本発明を実施することにより、冷却水中のベンゾトリア
ゾール濃度を現地にて、短時間で知ることが出来るため
、ベンゾ） ＩＪアゾールが不足している場合でも、す
ぐにベンゾトリアゾールを添加するなどの対応がとれる
。By implementing the present invention, the concentration of benzotriazole in cooling water can be determined on-site in a short time, so even if there is a shortage of benzo) IJ azole, measures such as adding benzotriazole immediately can be taken. can be removed.
このため、大きな障害の発生を未然に防ぐことが出来る
。Therefore, it is possible to prevent major failures from occurring.
また、分析に要する費用を削減出来る。Moreover, the cost required for analysis can be reduced.
Claims (1)
まれるベンゾトリアゾールと過不足無く反応して沈殿物
Ｃｕ（Ｃ＿６Ｈ＿５Ｎ＿３）＿２を生成させる量の銅を
含有しかつｐＨ７〜８に調整された銅含有水溶液に、ベ
ンゾトリアゾール濃度が未知の冷却水を上記一定量と等
しい量で加え、得られた沈殿物の量を、上記過不足ない
反応で得られる沈殿物 Ｃｕ（Ｃ＿６Ｈ＿４Ｎ＿３）＿２の量と目視で比較する
ことを特徴とする、冷却水中のベンゾトリアゾール濃度
の判定方法。[Claims] 1. Contains an amount of copper that reacts with benzotriazole contained in a certain amount of a benzotriazole aqueous solution of a predetermined concentration to form a precipitate Cu(C_6H_5N_3)_2 and has a pH of 7 to 8. Cooling water with an unknown benzotriazole concentration is added to the prepared copper-containing aqueous solution in an amount equal to the above fixed amount, and the amount of the obtained precipitate is calculated as the precipitate Cu(C_6H_4N_3)_2 obtained by the above reaction. A method for determining the concentration of benzotriazole in cooling water, the method comprising visually comparing the amount of benzotriazole in cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30612688A JPH02151764A (en) | 1988-12-05 | 1988-12-05 | Method for deciding benzotriazol concentration in cooling water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30612688A JPH02151764A (en) | 1988-12-05 | 1988-12-05 | Method for deciding benzotriazol concentration in cooling water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02151764A true JPH02151764A (en) | 1990-06-11 |
Family
ID=17953365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30612688A Pending JPH02151764A (en) | 1988-12-05 | 1988-12-05 | Method for deciding benzotriazol concentration in cooling water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02151764A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011191263A (en) * | 2010-03-16 | 2011-09-29 | Dowa Electronics Materials Co Ltd | Quantitative determination method of benzotriazol on surface of metal powder |
| WO2012081073A1 (en) * | 2010-12-13 | 2012-06-21 | 三菱電機株式会社 | Method for testing of electric insulating oil, method for treatment of electric insulating oil, and method for maintenance of oil-filled electric device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5940163A (en) * | 1982-08-30 | 1984-03-05 | Nissan Diesel Motor Co Ltd | Simple deterioration deciding method of cooling water or the like of internal combustion engine |
-
1988
- 1988-12-05 JP JP30612688A patent/JPH02151764A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5940163A (en) * | 1982-08-30 | 1984-03-05 | Nissan Diesel Motor Co Ltd | Simple deterioration deciding method of cooling water or the like of internal combustion engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011191263A (en) * | 2010-03-16 | 2011-09-29 | Dowa Electronics Materials Co Ltd | Quantitative determination method of benzotriazol on surface of metal powder |
| WO2012081073A1 (en) * | 2010-12-13 | 2012-06-21 | 三菱電機株式会社 | Method for testing of electric insulating oil, method for treatment of electric insulating oil, and method for maintenance of oil-filled electric device |
| US9228992B2 (en) | 2010-12-13 | 2016-01-05 | Mitsubishi Electric Corporation | Electric insulating oil inspection method, electric insulating oil treatment method, and oil-filled electric device maintenance method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zinterhofer et al. | Atomic absorption determination of lead in blood and urine in the presence of EDTA | |
| CN106770512A (en) | The assay method of fluohydric acid content in a kind of nitric hydrofluoric acid type Acidwash solution | |
| Zuehlke et al. | Copper speciation in marine waters | |
| Erwin et al. | The crystallization and dissolution of sodium urate | |
| JPH02151764A (en) | Method for deciding benzotriazol concentration in cooling water | |
| CN108267444A (en) | A kind of chelated acid is to the test method of the sequestering power of metal calcium ion | |
| Morris | Determination of Iron in Water in Presence of Heavy Metals | |
| Cherginets et al. | Potentiometric investigation of oxide solubilities in molten KCl–NaCl eutectic.: The effect of surface area of solid particles on the solubilities | |
| Carey et al. | Measurement of calcium activity in oral fluids by ion selective electrode: method evaluation and simplified calculation of ion activity products | |
| Blücher et al. | Influence of ppb levels of SO2 on the atmospheric corrosion of aluminum in the presence of NaCl | |
| JP4672473B2 (en) | Method and apparatus for measuring scale inhibitor concentration | |
| Lanzalaco et al. | The mineralization inhibitory potential of urines: a constant composition approach | |
| Sky-Peck | A method for determination of magnesium in serum and urine | |
| CN103592411B (en) | A kind of method of testing of capsule core release amount of concrete chemical self-repair microcapsule | |
| EP0285628A1 (en) | Method for determination of total carbonate content especially in biological fluids. | |
| Worthington et al. | Methods for determining the solubilities of some fluosilicates | |
| Fouda et al. | Inhibitory effect of some carbazides on corrosion of aluminium in hydrochloric acid and sodium hydroxide solutions | |
| JPS61280559A (en) | Continuous amperometric titration type determination device for nitrite or nitrate existing in aqueous medium | |
| Steers et al. | Micromethod for determination of tryptophan in bacteria and proteins | |
| Oyama et al. | A potentiometric study on complex formation of cadmium (II) and lead (II) ions with N-(2-hydroxyethyl) ethylenediamine-N, N', N'-triacetic acid. | |
| Watkins | Analytical methods of testing waters to be injected into subsurface oil-productive strata | |
| Majlesi et al. | Thermodynamic Study on the Protonation and Complexation of the Neuroleptic Drug, Gabapentin with Na+, Ca 2+ and Mg 2+ at Various Temperatures and Ionic Strengths | |
| Selig | Microdetermination of chloride and azide by sequential titration | |
| Lawrance et al. | Polarographic Determination of Nitrate | |
| US3457145A (en) | Liquid and gas analysis |