| 摘要 |
<p>The invention relates to a method of reducing the allergy-inducing (allergenic) activity of water-soluble Cr<VI> in cements and/or cement-containing preparations, which comprises selecting in preliminary experiments a lignosulphonate from the multiplicity of lignosulphonates available on the market which reduces, in the desired manner, the water-soluble Cr<VI> content on exposure of a cement and/or a cement-containing preparation to water, and adding this selected lignosulphonate to cements and/or cement-containing preparations prior to or during the addition of water in the production of fresh cement mixtures.</p> |
