2834 - Nitrites; nitrates:

This HTS category, 2834, encompasses inorganic nitrites and nitrates. These are chemical compounds characterized by the presence of the nitrite (NO₂⁻) or nitrate (NO₃⁻) ion. Such substances find diverse applications, including as fertilizers, explosives, preservatives, and reagents in various industrial processes. Their classification within Chapter 28 signifies their identity as inorganic chemicals, distinct from more complex organic compounds or finished products where these substances might be incorporated.

When classifying goods under 2834, it is crucial to distinguish them from sibling categories at the same level, which broadly cover other types of inorganic chemicals. For instance, Chapter 28 includes headings for elements, oxides, acids, and various salts, each with its specific scope. The defining feature of 2834 is the exclusive focus on compounds containing the nitrite or nitrate functional group.

The subdivisions within this category, 2834.10 for nitrites and the separate, implied category for nitrates, are based on the specific anion present. This distinction is important for detailed tariff purposes, as nitrites and nitrates can have different chemical properties, uses, and regulatory considerations, necessitating specific subheadings for accurate trade data collection and duty assessment.