JC/T 1043-2007Limit of lead extraction in faucets (English PDF)

3.1 Cold water volume

Under normal operating conditions, the device connects the supply of hot and

cold water, the cold water volume is the volume (from inlet to outlet) contained in the

part of device usually contacting cold water. This part of volume usually excludes the

water volume of the part of device which only contacts with hot water.

3.2 Cold mix volume adjustment factor (CMV)

The cold water volume of device divided by the entire water volume of device.

V - The volume of chlorine stock solution needed to be added, mL;

B - The volume of extraction water, L;

A - The concentration of chlorine stock solution, mg / mL.

5.2.1.3 0.4 mol/L Sodium bicarbonate solution

DISSOLVE 33.6 g of anhydrous sodium bicarbonate into reagent water, and

DILUTE it with reagent water to 1L, MIX well, PREPARE fresh solution every week.

5.2.2 Preparation of extraction water

TAKE 25 mL of 0.4 mol / L sodium bicarbonate solution (5.2.1.3), the right amount

of chlorine stock solution (5.2 1. 2), USE reagent water to DILUTE it to 1 L, USE 0.1

mol / L hydrochloric acid to adjust the pH value. The solution shall meet the following

requirements. pH. 8 0 ± 0 5, alkalinity. (500 ± 25) mg / L, inorganic carbon. (122 ± 5)

mg / L, chlorine. 2 mg / L.

5.3 Washing

RINSE the sample with water for 15 min, and then WASH it three times with

reagent water, WASH away residue and dirt within the sample.

5.4 Sample Adjustment

At room temperature of (23 ± 2) °C, WASH it with extraction water three times.

Extraction water shall completely fill the sample until the beginning of the extraction,

and the process shall not exceed 72 h.

5.5 Extraction

Extraction shall be conducted at room temperature of (23 ± 2) °C. After

conducting sample adjustment, FILL the sample with extraction water; ENSURE

extraction area is maximum. PLUG tightly both ends of the sample with clean cork

coated with a PTFE film or rubber stopper. EXTRACT it in accordance with extraction

order in Table 1. For example. On the 1st day 8. 00 am FILL extraction water;

REPLACE after 2 h; REPLACE continuously for four times; and COMPLETE the

replacement of water extraction at 16. 00 pm of that day; KEEP for 16 h; on the 2nd

day, REPEAT the same course of the 1st day. REPEAT the same course as the 1st

day on the 3rd day, the 4th day, and the 5th day; and COLLECT the extraction water

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