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Description LeadCheck® Swabs are non-hazardous and provide a rapid, sensitive and specific test for leachable lead on any surface. When lead is detected, LeadCheck® Swabs and/or the surface being tested turns pink or red on contact, depending on the concentration of lead present. In the vast majority of test situations results are obtained in less than 30 seconds. When detecting low levels of lead, or lead chromate containing pigments, results may take longer to develop. Each kit contains test confirmation cards to verify individual test results. |
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Sensitivity: |
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Stability: |
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Interferences: |
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How To Activate A LeadCheck® Swab: Each LeadCheck® Swab contains two crushable vials (see picture below). A lead reactive reagent is stored in one vial. The second vial contains pre-measured “activator’ solution to ensure proper conditions for the lead complex to form. When a swab is activated by crushing the vials and mixing the contents and the tip is brought in contact with lead, the pink (red) compound characteristic of lead forms. A confirmation card containing a small quantity of lead is included with the product to prove that the test was performed properly. Method |
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CRUSH - firmly at the two points indicated, first A then B. | |
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SHAKE AND SQUEEZE – Shake the Swab twice and squeeze gently until yellow liquid comes to the tip- the swab is now activated and ready for testing | |
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RUB -- While continuing to squeeze to keep the yellow liquid at the tip, vigorously rub the surface to be tested. If an unmistakable pink color forms on the tip of the swab, or on the surface being tested, lead is present at a hazardous level. |
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COLOR GUIDE FOR LEADCHECK® SWABS ON PAINT: LeadCheck® Swabs detect lead on painted surfaces and on other surfaces based on a reaction between lead and the lead reactive reagent. In this interaction color development increases in proportion to increasing lead concentration. LeadCheck® Swabs is the only qualitative colorimetric lead detection product that offers the user the opportunity to estimate lead concentration on a site. When LeadCheck® Swabs are used, it is possible to suggest lead concentration ranges associated with each series of color gradations. A series of colors developed at each concentration of lead would produce the following ranges. |
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5.0% --------------------------------------10.0% High Lead Concentration Range (5.0% to 10.0% lead) |
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0.5% --------------------------------------3.0% Medium Lead Concentration Range (0.5% to 3.0% lead) |
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0.0% -------------------------------------- 0.3% Low Lead Concentration Range (0.0% to 0.3% lead) |
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NOTE: 0.06% is 600 ppm; 0.1% is 1000 ppm; 0.5% is 5000 ppm, etc. | ||
I. The Reaction A LeadCheck® Swab contains two glass ampoules each containing the reagents required for the colorimetric detection of lead (II). One ampoule contains a lead reactive dye which under the proper conditions of pH and solvent conditions turns red. The second ampoule contains the buffers and solvents required to optimize the reaction of lead with the dye. LeadCheck® provides careful control of the ratio of solvent to dye which provides a reproducible and reliable test with an indefinite shelf-life. The reaction leads to a pink to deep red result on the tip of the swab (depending on the concentration of lead present and/or the surface being tested). The color development is linear with concentration. II. Sensitivity To determine the sensitivity of LeadCheck® Swabs, a standard curve was prepared with a standard paint solutions prepared by an outside laboratory. Dilutions of the standardpaint were applied to one cm square areas on plate glass. These were used to determine the standard curve. The painted squares were scraped off the glass, digested and quantitated by atomic absorption spectroscopy. The following table illustrates the reaction of LeadCheck® Swabs to each concentration of lead in paint. A clear gradation of color was observed and an arbitrary rating was assigned to each with 1.52+ indicating the 100% color saturation. |
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Lead Tested (% w/w) |
Color Result |
Rating (%) |
1.0, 0.7, 0.54 |
Deep red Deep red Red |
100, 98, 87 |
0.43 |
Red |
68 |
0.22 |
Medium red |
33 |
0.12, 0.06, 0 (no Pb (II)) |
Light pinkLight pink - easily seen Colorless |
20, 9, 0 |
These reactions were repeated five times with the same results. III. Specificity LeadCheck® Swabs are quite specific for lead. High levels of stannous chloride (tin) (5mg/ml) may interfere with color development; however the rate of reaction with lead is much faster than the rate of reaction with tin. High concentrations of silver may interfere with color development. IV. Reaction with Lead Chromate Paint LeadCheck® Swabs (PB2M) detect lead in lead chromate paint at the same levels as found for the lead nitrate standard. The reaction with lead chromate is significantly slower than other lead compounds taking as long as 30 minutes of constant contact to develop. |
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Third Party Documentation of the Performance of LeadCheck Swabs |
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