메이커 자료실

ALS : 비수용성 기준전극용(RE-7N) 용액 만드는 방법

관리자 2022-12-14 조회수 88

출처 : ALS Co., Ltd

Internal solution preparation

The internal solution of an Ag/Ag+ reference electrode used in a non aqueous solvent system consists mainly of a salt containing Ag+ ions and a supporting electrolyte added to the same non aqueous solvent as the solution sample to be measured.
Here, as an example, an acetonitrile (ACN) solution containing 0.01 mol/L silver(I) nitrate (AgNO3) and 0.1 mol/L tetrabutylammonium perchlorate (TBAP) is prepared.

NOTE:

The reagents used for preparation are not available at our company. Please prepare commercially available special grade reagents separately.
Please use acetonitrile that has been dried and dehydrated in advance.
Be sure to wear protective equipment while working, and be careful when handling chemical substances.
The amount of solution to be prepared is only a guide, so please consider it according to your experimental plan.

Preparation procedure

Fig. 1 What you need to prepare: 1. Volumetric flask;2. Spatula;3. Medicine wrapping paper;4. Beaker 50 mL;5. Pipette 1 mL;6. Glass rod;7. Light shielding bottle

Fig. 1 What you need to prepare:
(1) Volumetric flask (25 mL, 50 mL)
(2) Spatula
(3) Medicine wrapping paper
(4) Beaker 50 mL (2 pcs)
(5) Pipette 1 mL;
(6) Glass rod (stirring rod);
(7) Light shielding bottle

Fig. 2 Weigh 1.71 g tetrabutylammonium perchlorate using an analytical digital balance and medicine wrapping paper. The TBAP is then transferred from the medicine wrapping paper to a 50 mL beaker and a small amount of acetonitrile solution is added to the beaker to dissolve the TBAP.

Fig. 2 Weigh 1.71 g tetrabutylammonium perchlorate (TBAP) using an analytical digital balance and medicine wrapping paper. The TBAP is then transferred from the medicine wrapping paper to a 50 mL beaker, and a small amount of acetonitrile (ACN) solution is added to the beaker to dissolve the TBAP.

Fig. 3 Preparation of 0.1 mol/L TBAP/ACN solution. Transfer the solution from the beaker to a 50 mL volumetric flask using a glass rod or similar to prevent spillage. Using a 1 mL pipette adjust the volume of the volumetric flask to 50 mL while adding ACN solution to prepare a 0.1 mol/L TBAP/ACN solution.

Fig. 3 Transfer the solution from the beaker to a 50 mL volumetric flask using a glass rod or similar to prevent spillage. Using a 1 mL pipette, adjust the volume of the volumetric flask to 50 mL while adding ACN solution to prepare a 0.1 mol/L TBAP/ACN solution.

Fig. 4 Preparation of 0.1 mol/L Silver I nitrate in TBAP/ACN solution. Weigh 0.043 g silver I nitrate using an analytical digital balance and medicine wrapping paper. After weighing transfer AgNO3 from the medicine wrapping paper to another 50 mL beaker and add a small amount of the 0.1 M TBAP/ACN solution prepared earlier to dissolve the AgNO3.

Fig. 4 Weigh 0.043 g silver(I) nitrate (AgNO3) using an analytical digital balance and medicine wrapping paper. After weighing, transfer AgNO3 from the medicine wrapping paper to another 50 mL beaker and add a small amount of the 0.1 mol/L TBAP/ACN solution prepared earlier to dissolve the AgNO3.

Fig. 5 Weigh the potassium ferricyanide (1) using directly the beaker 50 mL (2) with an analytical digital balance.

Fig. 5 Transfer the solution from the beaker to a 25 mL volumetric flask using a glass rod or similar through the solution. Rinse the beaker further with acetonitrile (ACN) and repeat the process of transferring to a volumetric flask several times. Then, using a 1 mL pipette, add 0.1 mol/L TBAP/ACN solution while adjusting the volume of the volumetric flask to 25 mL.

Fig. 6 Transfer the 0.01 mol/L AgNO3/0.1 mol/L TBAP/ACN solution prepared in the previous section from a 25 mL volumetric flask to a light-shielded glass bottle for storage. The approximate storage time is about 1 month in a cool, dark place. Attach a label stating the composition and date of preparation or a toxicology-related label to the light-shielded glass bottle before storing.

다음글: BASi사 기준전극 팁 교체 방법

이전글: ALS : Mesh 타입 전극 폴리싱 방법