SHANGHAI, July 4 — China said on Wednesday that nearly a fifth of the food and consumer products that it checked in a nationwide survey this year were found to be substandard or tainted, underscoring the risk faced by its own consumers even as the country’s exports come under greater scrutiny overseas.

Regulators said the broad survey of foods, agricultural tools, clothing, women and children’s products and other types of goods turned up sizable quality and safety failure rates for products that are sold domestically.

The government said, for instance, that canned and preserved fruit and dried fish contained excessive bacteria; that 20 percent of the fruit and vegetable juice surveyed was deemed substandard, and that some children’s products were defective or laced with harmful chemicals.
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Regulators said, in effect, that goods sold in China were far more hazardous than the exports that were driving the country’s economic growth and now partly the subject of safety and quality debates.
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During the last month, regulators and quality inspectors say they have discovered candied fruit with 63 times the permitted amount of sweetener; excessive additives and preservatives in nearly 40 percent of the children’s snacks surveyed in western Guangxi province; fake human blood protein at hospitals; and food tainted with formaldehyde, illegal dyes and industrial wax.